cms.c - audio/dosmid - Rivoreo Source Code Repositories

 #ifdef CMS

 //#define CMS_DEBUG		// verbose to CMSLOG.TXT debug file
 //#define DRUMS_ONLY		// for percussion debug purpouses

 #ifdef CMS_DEBUG
 #include <stdio.h>
 #include <stdarg.h>
 #endif

 #include "cms.h"

 #ifdef CMS_DEBUG
 void debug_log(const char *fmt, ...)
 {
    FILE *f_log;
    va_list ap;

 	f_log = fopen("cmslog.log", "a");
 	va_start(ap, fmt);
         vfprintf(f_log, fmt, ap);
 	va_end(ap);
         fclose(f_log);
 }
 #endif

 mid_channel cms_synth[MAX_CMS_CHANNELS];	// CMS synth

 static unsigned short freqtable[128] = {
     8,    9,    9,   10,   10,   11,   12,   12,   13,   14,   15,   15,
    16,   17,   18,   19,   21,   22,   23,   24,   26,   28,   29,   31,
    33,   35,   37,   39,   41,   44,   46,   49,   52,   55,   58,   62,
    65,   69,   73,   78,   82,   87,   92,   98,  104,  110,  117,  123,
   131,  139,  147,  156,  165,  175,  185,  196,  208,  220,  233,  247,
   262,  277,  294,  311,  330,  349,  370,  392,  415,  440,  466,  494,
   523,  554,  587,  622,  659,  698,  740,  784,  831,  880,  932,  988,
  1047, 1109, 1175, 1245, 1319, 1397, 1480, 1568, 1661, 1760, 1865, 1976,
  2093, 2217, 2349, 2489, 2637, 2794, 2960, 3136, 3322, 3520, 3729, 3951,
  4186, 4435, 4699, 4978, 5274, 5588, 5920, 6272, 6645, 7040, 7459, 7902,
  8372, 8870, 9397, 9956,10548,11175,11840,12544};

 static unsigned short pitchtable[256] = {                    /* pitch wheel */
          29193U,29219U,29246U,29272U,29299U,29325U,29351U,29378U,  /* -128 */
          29405U,29431U,29458U,29484U,29511U,29538U,29564U,29591U,  /* -120 */
          29618U,29644U,29671U,29698U,29725U,29752U,29778U,29805U,  /* -112 */
          29832U,29859U,29886U,29913U,29940U,29967U,29994U,30021U,  /* -104 */
          30048U,30076U,30103U,30130U,30157U,30184U,30212U,30239U,  /*  -96 */
          30266U,30293U,30321U,30348U,30376U,30403U,30430U,30458U,  /*  -88 */
          30485U,30513U,30541U,30568U,30596U,30623U,30651U,30679U,  /*  -80 */
          30706U,30734U,30762U,30790U,30817U,30845U,30873U,30901U,  /*  -72 */
          30929U,30957U,30985U,31013U,31041U,31069U,31097U,31125U,  /*  -64 */
          31153U,31181U,31209U,31237U,31266U,31294U,31322U,31350U,  /*  -56 */
          31379U,31407U,31435U,31464U,31492U,31521U,31549U,31578U,  /*  -48 */
          31606U,31635U,31663U,31692U,31720U,31749U,31778U,31806U,  /*  -40 */
          31835U,31864U,31893U,31921U,31950U,31979U,32008U,32037U,  /*  -32 */
          32066U,32095U,32124U,32153U,32182U,32211U,32240U,32269U,  /*  -24 */
          32298U,32327U,32357U,32386U,32415U,32444U,32474U,32503U,  /*  -16 */
          32532U,32562U,32591U,32620U,32650U,32679U,32709U,32738U,  /*   -8 */
          32768U,32798U,32827U,32857U,32887U,32916U,32946U,32976U,  /*    0 */
          33005U,33035U,33065U,33095U,33125U,33155U,33185U,33215U,  /*    8 */
          33245U,33275U,33305U,33335U,33365U,33395U,33425U,33455U,  /*   16 */
          33486U,33516U,33546U,33576U,33607U,33637U,33667U,33698U,  /*   24 */
          33728U,33759U,33789U,33820U,33850U,33881U,33911U,33942U,  /*   32 */
          33973U,34003U,34034U,34065U,34095U,34126U,34157U,34188U,  /*   40 */
          34219U,34250U,34281U,34312U,34343U,34374U,34405U,34436U,  /*   48 */
          34467U,34498U,34529U,34560U,34591U,34623U,34654U,34685U,  /*   56 */
          34716U,34748U,34779U,34811U,34842U,34874U,34905U,34937U,  /*   64 */
          34968U,35000U,35031U,35063U,35095U,35126U,35158U,35190U,  /*   72 */
          35221U,35253U,35285U,35317U,35349U,35381U,35413U,35445U,  /*   80 */
          35477U,35509U,35541U,35573U,35605U,35637U,35669U,35702U,  /*   88 */
          35734U,35766U,35798U,35831U,35863U,35895U,35928U,35960U,  /*   96 */
          35993U,36025U,36058U,36090U,36123U,36155U,36188U,36221U,  /*  104 */
          36254U,36286U,36319U,36352U,36385U,36417U,36450U,36483U,  /*  112 */
          36516U,36549U,36582U,36615U,36648U,36681U,36715U,36748U}; /*  120 */

 unsigned char	CMSFreqMap[128] = {
 		0  ,  3,  7, 11, 15, 19, 23, 27,
 		31 , 34, 38, 41, 45, 48, 51, 55,
 		58 , 61, 64, 66, 69, 72, 75, 77,
 		80 , 83, 86, 88, 91, 94, 96, 99,
 		102,104,107,109,112,114,116,119,
 		121,123,125,128,130,132,134,136,
 		138,141,143,145,147,149,151,153,
 		155,157,159,161,162,164,166,168,
 		170,172,174,175,177,179,181,182,
 		184,186,188,189,191,193,194,196,
 		197,199,200,202,203,205,206,208,
 		209,210,212,213,214,216,217,218,
 		219,221,222,223,225,226,227,228,
 		229,231,232,233,234,235,236,237,
 		239,240,241,242,243,244,245,246,
 		247,249,250,251,252,253,254,255
 	};

 // CMS IO port address
 unsigned short cmsPort;


 // The 12 note-within-an-octave values for the SAA1099, starting at B
 static unsigned char noteAdr[] = {5, 32, 60, 85, 110, 132, 153, 173, 192, 210, 227, 243};

 // Volume
 static unsigned char atten[128] = {
                  0,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,
                  3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,
                  5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,
                  7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,
                  9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,
                  11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,
                  13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,
         	 15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
         };

 // Logic channel - first chip/second chip
 static unsigned char ChanReg[12] =  {000,001,002,003,004,005,000,001,002,003,004,005};

 // Set octave command
 static unsigned char OctavReg[12] = {0x10,0x10,0x11,0x11,0x12,0x12,0x10,0x10,0x11,0x11,0x12,0x12};

 unsigned char CmsOctaveStore[12];

 unsigned char ChanEnableReg[2] = {0,0};

 // Note priority
 unsigned char NotePriority;

 unsigned short channelpitch[16];

 void __declspec( naked ) cmsWrite(void)
 {
 /*
 	parameters
 	dx = port base+offset
 	ah = register
 	al = data
 */
 _asm
     {
 	inc  dx
 	xchg al,ah
 	out  dx,al
 	dec  dx
 	xchg al,ah
 	out  dx,al
         ret
     }
 }

 void __declspec( naked ) cmsNull(unsigned short port)
 {
 /*
 	parameters
 	dx = port offset to null
 */
 _asm
     {
 	add   dx,cmsPort // FIXME! CMSPortAddr
 	mov   cx,20h
 	xor   ax,ax
 loop_nul:           // null all 20 registers
 	call  cmsWrite
 	inc   ah
 	loop  loop_nul

 	mov   ax,1C02h // reset chip
 	call  cmsWrite

 	mov   ax,1C01h // enable this chip
 	call  cmsWrite

 	ret
     }
 }

 void cmsReset(unsigned short port)
 {
    unsigned char i;
    cmsPort = port;
    _asm
     {
 	mov  dx,0
 	call cmsNull
 	mov  dx,2
 	call cmsNull
     }
 	for (i=0;i<11;i++)CmsOctaveStore[i]=0;
 	ChanEnableReg[0]=0;
 	ChanEnableReg[1]=0;
         for (i=0;i<MAX_CMS_CHANNELS;i++)
         {
                 cms_synth[i].note=0;
                 cms_synth[i].priority=0;
     		cms_synth[i].ch = 0;
     		cms_synth[i].voice = 0;
     		cms_synth[i].velocity = 0;
         }
         for (i=0;i<16;i++)
         {
             channelpitch[i] = 8192;
         }
 	NotePriority = 0;
 }

 static void CMS_SetRegister(unsigned short regAddr, unsigned char reg, unsigned char val)
 {
     outp(regAddr + 1, reg); /* Select the register */
     outp(regAddr, val);     /* Set the value of the register */
 }

 #if 0
 void cmsDisableVoice(unsigned char voice)
 {
 	if (voice > 5)
 	    {
 		ChanEnableReg[1] &= ~(1 << ChanReg[voice]);
 		CMS_SetRegister(cmsPort + 2, 0x14, ChanEnableReg[1]);
 	    }
 	else
 	    {
 		ChanEnableReg[0] &= ~(1 << ChanReg[voice]);
 		CMS_SetRegister(cmsPort, 0x14, ChanEnableReg[0]);
 	    }
 }

 void cmsSound(unsigned char voice,unsigned char freq,unsigned char octave,unsigned char amplitudeLeft,unsigned char amplitudeRight)
 {
 	if (voice > 5)
 	    {
 		if (ChanReg[voice]&0x1 == 0)
 			CmsOctaveStore[OctavReg[voice]-0x10+3] = (CmsOctaveStore[OctavReg[voice]-0x10+3] & 0xF0) | octave;
 		else
 			CmsOctaveStore[OctavReg[voice]-0x10+3] = ((CmsOctaveStore[OctavReg[voice]-0x10+3] & 0xF) << 4) | octave;
 		CMS_SetRegister(cmsPort + 2, OctavReg[voice], CmsOctaveStore[OctavReg[voice]-0x10+3]);
 		CMS_SetRegister(cmsPort + 2, ChanReg[voice], (amplitudeLeft << 4) | amplitudeRight);
 		CMS_SetRegister(cmsPort + 2, ChanReg[voice] | 0x8, freq);
 		ChanEnableReg[1] |= 1 << ChanReg[voice];
 		CMS_SetRegister(cmsPort + 2, 0x14, ChanEnableReg[1]);
 	    }
 	else
 	    {
 		if (ChanReg[voice]&0x1 == 0)
 			CmsOctaveStore[OctavReg[voice]-0x10] = (CmsOctaveStore[OctavReg[voice]-0x10] & 0xF0) | octave;
 		else
 			CmsOctaveStore[OctavReg[voice]-0x10] = ((CmsOctaveStore[OctavReg[voice]-0x10] & 0xF) << 4) | octave;
 		CMS_SetRegister(cmsPort, OctavReg[voice], CmsOctaveStore[OctavReg[voice]-0x10]);
 		CMS_SetRegister(cmsPort, ChanReg[voice], (amplitudeLeft << 4) | amplitudeRight);
 		CMS_SetRegister(cmsPort, ChanReg[voice] | 0x8, freq);
 		ChanEnableReg[0] |= 1 << ChanReg[voice];
 		CMS_SetRegister(cmsPort, 0x14, ChanEnableReg[0]);
 	    }
 }

 #endif

 void cmsDisableVoice(unsigned char voice)
 {
 _asm
    {
 		xor   bh,bh
 		mov   bl,voice

 		mov   dx,cmsPort	// FIXME !!!

 		mov   bl,ChanReg[bx]	; bl = true channel (0 - 5)

 		xor   di,di
 		mov   cl,voice
 		cmp   cl,06h
                 jl    skip_inc
 		inc   di
                 add   dx,2
 skip_inc:
 		mov   al,14h
 		inc   dx
 		out   dx,al
 		dec   dx

 		mov   al,ChanEnableReg[di]
 		mov   ah,01h
 		mov   cl,bl
 		shl   ah,cl
 		not   ah
 		and   al,ah		; al = voice enable reg

 		out   dx,al
 		mov   ChanEnableReg[di],al
     }
 }


 void cmsSetVolume(unsigned char voice,unsigned char amplitudeLeft,unsigned char amplitudeRight)
 {
 _asm
    {
 		xor   bh,bh
 		mov   bl,voice

 		mov   dx,cmsPort	// FIXME !!!
 		cmp   bl,06h		; check channel num > 5?
 		jl    setVol	; yes - set port = port + 2
 		add   dx,2
 setVol:
 		mov   bl,ChanReg[bx]	; bx = true channel (0 - 5)
 		mov   al,byte ptr amplitudeLeft
 		mov   ah,byte ptr amplitudeRight
 		mov   cl,4
 		shl   ah,cl
 		or    al,ah
 		mov   ah,bl
 		call cmsWrite
    }
 }

 void cmsSound(unsigned char voice,unsigned char freq,unsigned char octave,unsigned char amplitudeLeft,unsigned char amplitudeRight)
 {
 _asm
    {
 		xor   bh,bh
 		mov   bl,voice

 		mov   dx,cmsPort	// FIXME !!!
 		cmp   bl,06h		; check channel num > 5?
 		jl    setOctave	; yes - set port = port + 2
 		add   dx,2
 setOctave:
 		mov   bl,ChanReg[bx]	; bx = true channel (0 - 5) //FIXME swap down
 		mov   ah,OctavReg[bx]   ; ah = Set octave command   //FIXME swap up
 ;
 ;	ah now = register
 ;		0,1,6,7=$10
 ;		2,3,8,9=$11
 ;		4,5,10,11=$12
 ;
 ;	CMS octave regs are write only, so we have to track
 ;	the values in adjoining voices manually

 		mov   al,ah
 		xor   ah,ah		; ax = set octave cmd (10h - 12h)
 		mov   di,ax		; di = ax
 		sub   di,010h		; di = octave cmd - 10h (0..2 index)
 		mov   cl,voice
 		cmp   cl,06h
                 jl    skip_inc
 		add   di,3
 skip_inc:
 		mov   ah,al		; set ah back to octave cmd

 		mov   al,byte ptr CmsOctaveStore[di]
 		mov   bh,octave
 		test  bl,01h
 		jnz   shiftOctave
 		and   al,0F0h
 		jmp   outOctave
 shiftOctave:
 		and   al,0Fh
 		mov   cl,4
 		shl   bh,cl
 outOctave:
 		or    al,bh
 		mov   byte ptr CmsOctaveStore[di],al
 		call cmsWrite		; set octave to CMS
 setAmp:
 		mov   al,byte ptr amplitudeLeft
 		mov   ah,byte ptr amplitudeRight
 		;and   al,0Fh
 		mov   cl,4
 		shl   ah,cl
 		or    al,ah
 		mov   ah,bl
 		call cmsWrite
 setFreq:
 		mov   al,byte ptr freq
 		or    ah,08h


 		call cmsWrite
 voiceEnable:
 		mov   al,14h
 		inc   dx
 		out   dx,al
 		dec   dx

 		xor   di,di
 		mov   cl,voice
 		cmp   cl,06h
                 jl    skip_inc2
 		inc   di
 skip_inc2:
 		mov   al,ChanEnableReg[di]
 		mov   ah,01h
 		mov   cl,bl
 		shl   ah,cl
 		or    al,ah
 		out   dx,al
 		mov   ChanEnableReg[di],al
     }
 }

 // ****
 // High-level CMS synth procedures
 // ****

 void cms_pitchwheel(unsigned short oplport, int channel, int pitchwheel)
 {
   unsigned char i;
   unsigned short notefreq;
   unsigned short period;
   unsigned char mixer;
   unsigned char note;
   int pitch;
   unsigned char octave;

     channelpitch[channel] = pitchwheel;
     for(i=0; i<MAX_CMS_CHANNELS; i++)
     {
         if ((cms_synth[i].ch==channel) && (cms_synth[i].note != 0))
         {
          note = cms_synth[i].note;

          pitch = pitchwheel;
          if (pitch != 0) {
            if (pitch > 127) {
               pitch = 127;
            } else if (pitch < -128) {
               pitch = -128;
            }
          }

         notefreq = ((unsigned long)freqtable[note] * pitchtable[pitch + 128]) >> 15;

 	if ((notefreq > 31) && (notefreq < 7824))
 	{
 		octave=4;
 		while (notefreq<489)
 	 		{
 				notefreq=notefreq*2;
 				octave--;
 			}
 		while (notefreq>977)
 			{
 				notefreq=notefreq / 2;
 				octave++;
 			}

 #ifndef DRUMS_ONLY
 		cmsSound(cms_synth[i].voice,CMSFreqMap[((notefreq-489)*128) / 489],octave,atten[cms_synth[i].velocity],atten[cms_synth[i].velocity]);
 #endif

         }
       }
    }
 }

 void cmsNoteOff(unsigned char channel, unsigned char note)
 {
   unsigned char i;
   unsigned char voice;

     if (channel == 9)
     {
 #ifdef CMS_DEBUG
        debug_log("DRUM OFF note= %u\n",note);
 #endif
 	CMS_SetRegister(cmsPort+2, 0x19, 0x0);
 	CMS_SetRegister(cmsPort+2, 0x15, 0x0); // noise ch 11
 	cmsDisableVoice(11);
     }
     else
     {

     voice = MAX_CMS_CHANNELS;
     for(i=0; i<MAX_CMS_CHANNELS; i++)
     {
       	if(cms_synth[i].note==note)
       	{
         	voice = i;
         	break;
       	}
     }


     // Note not found, ignore note off command
     if(voice==MAX_CMS_CHANNELS)
     {
 #ifdef CMS_DEBUG
 	debug_log("not found Ch=%u,note=%u\n",channel & 0xFF,note & 0xFF);
 #endif
     	return;
     }

     // decrease priority for all notes greater than current
     for (i=0; i<MAX_CMS_CHANNELS; i++)
 	if (cms_synth[i].priority > cms_synth[voice].priority )
 		cms_synth[i].priority = cms_synth[i].priority - 1;


     if (NotePriority != 0) NotePriority--;

     cmsDisableVoice(voice);
     cms_synth[voice].note = 0;
     cms_synth[voice].priority = 0;
     cms_synth[voice].ch = 0;
     cms_synth[voice].voice = 0;
     cms_synth[voice].velocity = 0;
    }
 }

 void cmsNoteOn(unsigned char channel, unsigned char note, unsigned char velocity)
 {
   unsigned char octave;
   unsigned char noteVal;
   unsigned char i;
   unsigned char voice;
   unsigned char note_cms;
   unsigned notefreq;
   int pitch;

   if (channel == 9)
   {
     if (velocity != 0)
        {
 #ifdef CMS_DEBUG
        debug_log("DRUM ON note= %u\n",note);
 #endif
 	CMS_SetRegister(cmsPort+2, 0x19, 0x84); // single dacay
 	switch (note) {
 		case 37: // Side Stick
 			CMS_SetRegister(cmsPort+2, 0x16, 0x00); // noise gen 1 31.3kHz
 			CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
 			cmsSound(11,0,2,atten[velocity],atten[velocity]);
 			break;
 		case 38: // Acoustic Snare
 			CMS_SetRegister(cmsPort+2, 0x16, 0x00); // noise gen 1 31.3kHz
 			CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
 			cmsSound(11,0,0,atten[velocity],atten[velocity]);
 			break;
 		case 39: // Hand Clap
 			CMS_SetRegister(cmsPort+2, 0x16, 0x10); // noise gen 1 15.6kHz
 			CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
 			cmsSound(11,0,3,atten[velocity],atten[velocity]);
 			break;
 		case 40: // Electric Snare
 			CMS_SetRegister(cmsPort+2, 0x16, 0x10); // noise gen 1 15.6kHz
 			CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
 			cmsSound(11,0,1,atten[velocity],atten[velocity]);
 			break;
 		case 42: // Closed Hi Hat
 			CMS_SetRegister(cmsPort+2, 0x16, 0x10); // noise gen 1 15.6kHz
 			CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
 			cmsSound(11,0,2,atten[velocity],atten[velocity]);
 			break;
 		case 44: // Pedal Hi-Hat
 			CMS_SetRegister(cmsPort+2, 0x16, 0x10); // noise gen 1 15.6kHz
 			CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
 			cmsSound(11,0,0,atten[velocity],atten[velocity]);
 			break;
 		case 52: // Chinese Cymbal
 			CMS_SetRegister(cmsPort+2, 0x16, 0x20); // noise gen 1 7.6kHz
 			CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
 			cmsSound(11,0,2,atten[velocity],atten[velocity]);
 			break;
 		case 55: // Splash Cymbal
 			CMS_SetRegister(cmsPort+2, 0x16, 0x20); // noise gen 1 7.6kHz
 			CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
 			cmsSound(11,0,0,atten[velocity],atten[velocity]);
 			break;
 		case 71: // Short Whistle
 		case 72: // Long Whistle
 			cmsSound(11,0,6,atten[velocity],atten[velocity]);
 			break;
 		default:
 			cmsSound(11,0,1,atten[velocity],atten[velocity]);
         }
        }
     else
        {
 	CMS_SetRegister(cmsPort+2, 0x19, 0x0);
 	CMS_SetRegister(cmsPort+2, 0x15, 0x0); // noise ch 11
 	cmsDisableVoice(11);
        }
   }
   else
   if (velocity != 0)
   {
 /*
 	note_cms = note+1;

 	octave = (note_cms / 12) - 1; //Some fancy math to get the correct octave
   	noteVal = note_cms - ((octave + 1) * 12); //More fancy math to get the correct note
 */
 	NotePriority++;

         voice = MAX_CMS_CHANNELS;
     	for(i=0; i<MAX_CMS_CHANNELS; i++)
     	{
       		if(cms_synth[i].note==0)
       		{
         		voice = i;
         		break;
       		}
     	}


   	// We run out of voices, find low priority voice
   	if(voice==MAX_CMS_CHANNELS)
   	{
 		unsigned char min_prior = cms_synth[0].priority;

 #ifdef CMS_DEBUG
 	debug_log("out of voice. NotePriority=%u\n",NotePriority);
     		for (i=0; i<MAX_CMS_CHANNELS; i++)
 		  debug_log("%u ",cms_synth[i].priority);
 	debug_log("\n");
 #endif
 		// find note with min prioryty
 		voice = 0;
     		for (i=1; i<MAX_CMS_CHANNELS; i++)
 		  if (cms_synth[i].priority < min_prior)
 		  {
 			voice = i;
                         min_prior = cms_synth[i].priority;
                   }

 		// decrease all notes priority by one
     		for (i=0; i<MAX_CMS_CHANNELS; i++)
 		  if (cms_synth[i].priority != 0)
 			cms_synth[i].priority = cms_synth[i].priority - 1;

 		// decrease current priority
 		if (NotePriority != 0) NotePriority--;

 #ifdef CMS_DEBUG
 	debug_log("find low priority voice %u, NotePriority=%u\n",voice,NotePriority);
     		for (i=0; i<MAX_CMS_CHANNELS; i++)
 		  debug_log("%u ",cms_synth[i].priority);
 	debug_log("\n");
 #endif
   	}

         pitch = channelpitch[channel];
         if (pitch != 0) {
            if (pitch > 127) {
               pitch = 127;
            } else if (pitch < -128) {
               pitch = -128;
            }
         }

         notefreq = ((unsigned long)freqtable[note] * pitchtable[pitch + 128]) >> 15;

 	if ((notefreq > 31) && (notefreq < 7824))
 	{
 		octave=4;
 		while (notefreq<489)
 	 		{
 				notefreq=notefreq*2;
 				octave--;
 			}
 		while (notefreq>977)
 			{
 				notefreq=notefreq / 2;
 				octave++;
 			}

 #ifndef DRUMS_ONLY
 		cmsSound(voice,CMSFreqMap[((notefreq-489)*128) / 489],octave,atten[velocity],atten[velocity]);
 #endif

 		cms_synth[voice].note = note;
 		cms_synth[voice].priority = NotePriority;
 		cms_synth[voice].velocity = velocity;
         	cms_synth[voice].ch = channel;
         	cms_synth[voice].voice = voice;
 	}

   }
   else
         cmsNoteOff(channel,note);
 }


 void cmsTick(void)
 {
 #if 0
   unsigned char i;
   unsigned char noteVal;

   for (i=0;i<MAX_CMS_CHANNELS;i++)
     if (cms_synth[i].note != 0)
 	{
 		noteVal = cms_synth[i].volume-1;
 		if (noteVal != 0)
 			{
 				cmsSetVolume(i,atten[noteVal],atten[noteVal]);
 				cms_synth[i].volume = noteVal;
 			}
 		else
 			{
     				cmsDisableVoice(i);
 				cms_synth[i].volume = 0;
 				cms_synth[i].note = 0;
 			}
 	}
 #endif
 }

 void cmsController(unsigned char channel, unsigned char id, unsigned char val)
 {
   unsigned char i;
     if ((id==121) || (id==123)) // All Sound/Notes Off
     {
   		for (i=0;i<MAX_CMS_CHANNELS;i++)
     		  if (cms_synth[i].note != 0)
 		 	{
     				cmsDisableVoice(i);
 				cms_synth[i].note = 0;
 				cms_synth[i].priority = 0;
     				cms_synth[i].ch = 0;
     				cms_synth[i].voice = 0;
     				cms_synth[i].velocity = 0;
 		 	}
 		if (id==121)
 		{
         		for (i=0;i<16;i++)
             			channelpitch[i] = 8192;
 		}
     }
 }

 #endif
	#ifdef CMS

	//#define CMS_DEBUG // verbose to CMSLOG.TXT debug file
	//#define DRUMS_ONLY // for percussion debug purpouses

	#ifdef CMS_DEBUG
	#include <stdio.h>
	#include <stdarg.h>
	#endif

	#include "cms.h"

	#ifdef CMS_DEBUG
	void debug_log(const char *fmt, ...)
	{
	FILE *f_log;
	va_list ap;

	f_log = fopen("cmslog.log", "a");
	va_start(ap, fmt);
	vfprintf(f_log, fmt, ap);
	va_end(ap);
	fclose(f_log);
	}
	#endif

	mid_channel cms_synth[MAX_CMS_CHANNELS]; // CMS synth

	static unsigned short freqtable[128] = {
	8, 9, 9, 10, 10, 11, 12, 12, 13, 14, 15, 15,
	16, 17, 18, 19, 21, 22, 23, 24, 26, 28, 29, 31,
	33, 35, 37, 39, 41, 44, 46, 49, 52, 55, 58, 62,
	65, 69, 73, 78, 82, 87, 92, 98, 104, 110, 117, 123,
	131, 139, 147, 156, 165, 175, 185, 196, 208, 220, 233, 247,
	262, 277, 294, 311, 330, 349, 370, 392, 415, 440, 466, 494,
	523, 554, 587, 622, 659, 698, 740, 784, 831, 880, 932, 988,
	1047, 1109, 1175, 1245, 1319, 1397, 1480, 1568, 1661, 1760, 1865, 1976,
	2093, 2217, 2349, 2489, 2637, 2794, 2960, 3136, 3322, 3520, 3729, 3951,
	4186, 4435, 4699, 4978, 5274, 5588, 5920, 6272, 6645, 7040, 7459, 7902,
	8372, 8870, 9397, 9956,10548,11175,11840,12544};

	static unsigned short pitchtable[256] = { /* pitch wheel */
	29193U,29219U,29246U,29272U,29299U,29325U,29351U,29378U, /* -128 */
	29405U,29431U,29458U,29484U,29511U,29538U,29564U,29591U, /* -120 */
	29618U,29644U,29671U,29698U,29725U,29752U,29778U,29805U, /* -112 */
	29832U,29859U,29886U,29913U,29940U,29967U,29994U,30021U, /* -104 */
	30048U,30076U,30103U,30130U,30157U,30184U,30212U,30239U, /* -96 */
	30266U,30293U,30321U,30348U,30376U,30403U,30430U,30458U, /* -88 */
	30485U,30513U,30541U,30568U,30596U,30623U,30651U,30679U, /* -80 */
	30706U,30734U,30762U,30790U,30817U,30845U,30873U,30901U, /* -72 */
	30929U,30957U,30985U,31013U,31041U,31069U,31097U,31125U, /* -64 */
	31153U,31181U,31209U,31237U,31266U,31294U,31322U,31350U, /* -56 */
	31379U,31407U,31435U,31464U,31492U,31521U,31549U,31578U, /* -48 */
	31606U,31635U,31663U,31692U,31720U,31749U,31778U,31806U, /* -40 */
	31835U,31864U,31893U,31921U,31950U,31979U,32008U,32037U, /* -32 */
	32066U,32095U,32124U,32153U,32182U,32211U,32240U,32269U, /* -24 */
	32298U,32327U,32357U,32386U,32415U,32444U,32474U,32503U, /* -16 */
	32532U,32562U,32591U,32620U,32650U,32679U,32709U,32738U, /* -8 */
	32768U,32798U,32827U,32857U,32887U,32916U,32946U,32976U, /* 0 */
	33005U,33035U,33065U,33095U,33125U,33155U,33185U,33215U, /* 8 */
	33245U,33275U,33305U,33335U,33365U,33395U,33425U,33455U, /* 16 */
	33486U,33516U,33546U,33576U,33607U,33637U,33667U,33698U, /* 24 */
	33728U,33759U,33789U,33820U,33850U,33881U,33911U,33942U, /* 32 */
	33973U,34003U,34034U,34065U,34095U,34126U,34157U,34188U, /* 40 */
	34219U,34250U,34281U,34312U,34343U,34374U,34405U,34436U, /* 48 */
	34467U,34498U,34529U,34560U,34591U,34623U,34654U,34685U, /* 56 */
	34716U,34748U,34779U,34811U,34842U,34874U,34905U,34937U, /* 64 */
	34968U,35000U,35031U,35063U,35095U,35126U,35158U,35190U, /* 72 */
	35221U,35253U,35285U,35317U,35349U,35381U,35413U,35445U, /* 80 */
	35477U,35509U,35541U,35573U,35605U,35637U,35669U,35702U, /* 88 */
	35734U,35766U,35798U,35831U,35863U,35895U,35928U,35960U, /* 96 */
	35993U,36025U,36058U,36090U,36123U,36155U,36188U,36221U, /* 104 */
	36254U,36286U,36319U,36352U,36385U,36417U,36450U,36483U, /* 112 */
	36516U,36549U,36582U,36615U,36648U,36681U,36715U,36748U}; /* 120 */

	unsigned char CMSFreqMap[128] = {
	0 , 3, 7, 11, 15, 19, 23, 27,
	31 , 34, 38, 41, 45, 48, 51, 55,
	58 , 61, 64, 66, 69, 72, 75, 77,
	80 , 83, 86, 88, 91, 94, 96, 99,
	102,104,107,109,112,114,116,119,
	121,123,125,128,130,132,134,136,
	138,141,143,145,147,149,151,153,
	155,157,159,161,162,164,166,168,
	170,172,174,175,177,179,181,182,
	184,186,188,189,191,193,194,196,
	197,199,200,202,203,205,206,208,
	209,210,212,213,214,216,217,218,
	219,221,222,223,225,226,227,228,
	229,231,232,233,234,235,236,237,
	239,240,241,242,243,244,245,246,
	247,249,250,251,252,253,254,255
	};

	// CMS IO port address
	unsigned short cmsPort;


	// The 12 note-within-an-octave values for the SAA1099, starting at B
	static unsigned char noteAdr[] = {5, 32, 60, 85, 110, 132, 153, 173, 192, 210, 227, 243};

	// Volume
	static unsigned char atten[128] = {
	0,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,
	3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,
	5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,
	7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,
	9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,
	11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,
	13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,
	15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
	};

	// Logic channel - first chip/second chip
	static unsigned char ChanReg[12] = {000,001,002,003,004,005,000,001,002,003,004,005};

	// Set octave command
	static unsigned char OctavReg[12] = {0x10,0x10,0x11,0x11,0x12,0x12,0x10,0x10,0x11,0x11,0x12,0x12};

	unsigned char CmsOctaveStore[12];

	unsigned char ChanEnableReg[2] = {0,0};

	// Note priority
	unsigned char NotePriority;

	unsigned short channelpitch[16];

	void __declspec( naked ) cmsWrite(void)
	{
	/*
	parameters
	dx = port base+offset
	ah = register
	al = data
	*/
	_asm
	{
	inc dx
	xchg al,ah
	out dx,al
	dec dx
	xchg al,ah
	out dx,al
	ret
	}
	}

	void __declspec( naked ) cmsNull(unsigned short port)
	{
	/*
	parameters
	dx = port offset to null
	*/
	_asm
	{
	add dx,cmsPort // FIXME! CMSPortAddr
	mov cx,20h
	xor ax,ax
	loop_nul: // null all 20 registers
	call cmsWrite
	inc ah
	loop loop_nul

	mov ax,1C02h // reset chip
	call cmsWrite

	mov ax,1C01h // enable this chip
	call cmsWrite

	ret
	}
	}

	void cmsReset(unsigned short port)
	{
	unsigned char i;
	cmsPort = port;
	_asm
	{
	mov dx,0
	call cmsNull
	mov dx,2
	call cmsNull
	}
	for (i=0;i<11;i++)CmsOctaveStore[i]=0;
	ChanEnableReg[0]=0;
	ChanEnableReg[1]=0;
	for (i=0;i<MAX_CMS_CHANNELS;i++)
	{
	cms_synth[i].note=0;
	cms_synth[i].priority=0;
	cms_synth[i].ch = 0;
	cms_synth[i].voice = 0;
	cms_synth[i].velocity = 0;
	}
	for (i=0;i<16;i++)
	{
	channelpitch[i] = 8192;
	}
	NotePriority = 0;
	}

	static void CMS_SetRegister(unsigned short regAddr, unsigned char reg, unsigned char val)
	{
	outp(regAddr + 1, reg); /* Select the register */
	outp(regAddr, val); /* Set the value of the register */
	}

	#if 0
	void cmsDisableVoice(unsigned char voice)
	{
	if (voice > 5)
	{
	ChanEnableReg[1] &= ~(1 << ChanReg[voice]);
	CMS_SetRegister(cmsPort + 2, 0x14, ChanEnableReg[1]);
	}
	else
	{
	ChanEnableReg[0] &= ~(1 << ChanReg[voice]);
	CMS_SetRegister(cmsPort, 0x14, ChanEnableReg[0]);
	}
	}

	void cmsSound(unsigned char voice,unsigned char freq,unsigned char octave,unsigned char amplitudeLeft,unsigned char amplitudeRight)
	{
	if (voice > 5)
	{
	if (ChanReg[voice]&0x1 == 0)
	CmsOctaveStore[OctavReg[voice]-0x10+3] = (CmsOctaveStore[OctavReg[voice]-0x10+3] & 0xF0) \| octave;
	else
	CmsOctaveStore[OctavReg[voice]-0x10+3] = ((CmsOctaveStore[OctavReg[voice]-0x10+3] & 0xF) << 4) \| octave;
	CMS_SetRegister(cmsPort + 2, OctavReg[voice], CmsOctaveStore[OctavReg[voice]-0x10+3]);
	CMS_SetRegister(cmsPort + 2, ChanReg[voice], (amplitudeLeft << 4) \| amplitudeRight);
	CMS_SetRegister(cmsPort + 2, ChanReg[voice] \| 0x8, freq);
	ChanEnableReg[1] \|= 1 << ChanReg[voice];
	CMS_SetRegister(cmsPort + 2, 0x14, ChanEnableReg[1]);
	}
	else
	{
	if (ChanReg[voice]&0x1 == 0)
	CmsOctaveStore[OctavReg[voice]-0x10] = (CmsOctaveStore[OctavReg[voice]-0x10] & 0xF0) \| octave;
	else
	CmsOctaveStore[OctavReg[voice]-0x10] = ((CmsOctaveStore[OctavReg[voice]-0x10] & 0xF) << 4) \| octave;
	CMS_SetRegister(cmsPort, OctavReg[voice], CmsOctaveStore[OctavReg[voice]-0x10]);
	CMS_SetRegister(cmsPort, ChanReg[voice], (amplitudeLeft << 4) \| amplitudeRight);
	CMS_SetRegister(cmsPort, ChanReg[voice] \| 0x8, freq);
	ChanEnableReg[0] \|= 1 << ChanReg[voice];
	CMS_SetRegister(cmsPort, 0x14, ChanEnableReg[0]);
	}
	}

	#endif

	void cmsDisableVoice(unsigned char voice)
	{
	_asm
	{
	xor bh,bh
	mov bl,voice

	mov dx,cmsPort // FIXME !!!

	mov bl,ChanReg[bx] ; bl = true channel (0 - 5)

	xor di,di
	mov cl,voice
	cmp cl,06h
	jl skip_inc
	inc di
	add dx,2
	skip_inc:
	mov al,14h
	inc dx
	out dx,al
	dec dx

	mov al,ChanEnableReg[di]
	mov ah,01h
	mov cl,bl
	shl ah,cl
	not ah
	and al,ah ; al = voice enable reg

	out dx,al
	mov ChanEnableReg[di],al
	}
	}


	void cmsSetVolume(unsigned char voice,unsigned char amplitudeLeft,unsigned char amplitudeRight)
	{
	_asm
	{
	xor bh,bh
	mov bl,voice

	mov dx,cmsPort // FIXME !!!
	cmp bl,06h ; check channel num > 5?
	jl setVol ; yes - set port = port + 2
	add dx,2
	setVol:
	mov bl,ChanReg[bx] ; bx = true channel (0 - 5)
	mov al,byte ptr amplitudeLeft
	mov ah,byte ptr amplitudeRight
	mov cl,4
	shl ah,cl
	or al,ah
	mov ah,bl
	call cmsWrite
	}
	}

	void cmsSound(unsigned char voice,unsigned char freq,unsigned char octave,unsigned char amplitudeLeft,unsigned char amplitudeRight)
	{
	_asm
	{
	xor bh,bh
	mov bl,voice

	mov dx,cmsPort // FIXME !!!
	cmp bl,06h ; check channel num > 5?
	jl setOctave ; yes - set port = port + 2
	add dx,2
	setOctave:
	mov bl,ChanReg[bx] ; bx = true channel (0 - 5) //FIXME swap down
	mov ah,OctavReg[bx] ; ah = Set octave command //FIXME swap up
	;
	; ah now = register
	; 0,1,6,7=$10
	; 2,3,8,9=$11
	; 4,5,10,11=$12
	;
	; CMS octave regs are write only, so we have to track
	; the values in adjoining voices manually

	mov al,ah
	xor ah,ah ; ax = set octave cmd (10h - 12h)
	mov di,ax ; di = ax
	sub di,010h ; di = octave cmd - 10h (0..2 index)
	mov cl,voice
	cmp cl,06h
	jl skip_inc
	add di,3
	skip_inc:
	mov ah,al ; set ah back to octave cmd

	mov al,byte ptr CmsOctaveStore[di]
	mov bh,octave
	test bl,01h
	jnz shiftOctave
	and al,0F0h
	jmp outOctave
	shiftOctave:
	and al,0Fh
	mov cl,4
	shl bh,cl
	outOctave:
	or al,bh
	mov byte ptr CmsOctaveStore[di],al
	call cmsWrite ; set octave to CMS
	setAmp:
	mov al,byte ptr amplitudeLeft
	mov ah,byte ptr amplitudeRight
	;and al,0Fh
	mov cl,4
	shl ah,cl
	or al,ah
	mov ah,bl
	call cmsWrite
	setFreq:
	mov al,byte ptr freq
	or ah,08h


	call cmsWrite
	voiceEnable:
	mov al,14h
	inc dx
	out dx,al
	dec dx

	xor di,di
	mov cl,voice
	cmp cl,06h
	jl skip_inc2
	inc di
	skip_inc2:
	mov al,ChanEnableReg[di]
	mov ah,01h
	mov cl,bl
	shl ah,cl
	or al,ah
	out dx,al
	mov ChanEnableReg[di],al
	}
	}

	// ****
	// High-level CMS synth procedures
	// ****

	void cms_pitchwheel(unsigned short oplport, int channel, int pitchwheel)
	{
	unsigned char i;
	unsigned short notefreq;
	unsigned short period;
	unsigned char mixer;
	unsigned char note;
	int pitch;
	unsigned char octave;

	channelpitch[channel] = pitchwheel;
	for(i=0; i<MAX_CMS_CHANNELS; i++)
	{
	if ((cms_synth[i].ch==channel) && (cms_synth[i].note != 0))
	{
	note = cms_synth[i].note;

	pitch = pitchwheel;
	if (pitch != 0) {
	if (pitch > 127) {
	pitch = 127;
	} else if (pitch < -128) {
	pitch = -128;
	}
	}

	notefreq = ((unsigned long)freqtable[note] * pitchtable[pitch + 128]) >> 15;

	if ((notefreq > 31) && (notefreq < 7824))
	{
	octave=4;
	while (notefreq<489)
	{
	notefreq=notefreq*2;
	octave--;
	}
	while (notefreq>977)
	{
	notefreq=notefreq / 2;
	octave++;
	}

	#ifndef DRUMS_ONLY
	cmsSound(cms_synth[i].voice,CMSFreqMap[((notefreq-489)*128) / 489],octave,atten[cms_synth[i].velocity],atten[cms_synth[i].velocity]);
	#endif

	}
	}
	}
	}

	void cmsNoteOff(unsigned char channel, unsigned char note)
	{
	unsigned char i;
	unsigned char voice;

	if (channel == 9)
	{
	#ifdef CMS_DEBUG
	debug_log("DRUM OFF note= %u\n",note);
	#endif
	CMS_SetRegister(cmsPort+2, 0x19, 0x0);
	CMS_SetRegister(cmsPort+2, 0x15, 0x0); // noise ch 11
	cmsDisableVoice(11);
	}
	else
	{

	voice = MAX_CMS_CHANNELS;
	for(i=0; i<MAX_CMS_CHANNELS; i++)
	{
	if(cms_synth[i].note==note)
	{
	voice = i;
	break;
	}
	}


	// Note not found, ignore note off command
	if(voice==MAX_CMS_CHANNELS)
	{
	#ifdef CMS_DEBUG
	debug_log("not found Ch=%u,note=%u\n",channel & 0xFF,note & 0xFF);
	#endif
	return;
	}

	// decrease priority for all notes greater than current
	for (i=0; i<MAX_CMS_CHANNELS; i++)
	if (cms_synth[i].priority > cms_synth[voice].priority )
	cms_synth[i].priority = cms_synth[i].priority - 1;


	if (NotePriority != 0) NotePriority--;

	cmsDisableVoice(voice);
	cms_synth[voice].note = 0;
	cms_synth[voice].priority = 0;
	cms_synth[voice].ch = 0;
	cms_synth[voice].voice = 0;
	cms_synth[voice].velocity = 0;
	}
	}

	void cmsNoteOn(unsigned char channel, unsigned char note, unsigned char velocity)
	{
	unsigned char octave;
	unsigned char noteVal;
	unsigned char i;
	unsigned char voice;
	unsigned char note_cms;
	unsigned notefreq;
	int pitch;

	if (channel == 9)
	{
	if (velocity != 0)
	{
	#ifdef CMS_DEBUG
	debug_log("DRUM ON note= %u\n",note);
	#endif
	CMS_SetRegister(cmsPort+2, 0x19, 0x84); // single dacay
	switch (note) {
	case 37: // Side Stick
	CMS_SetRegister(cmsPort+2, 0x16, 0x00); // noise gen 1 31.3kHz
	CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
	cmsSound(11,0,2,atten[velocity],atten[velocity]);
	break;
	case 38: // Acoustic Snare
	CMS_SetRegister(cmsPort+2, 0x16, 0x00); // noise gen 1 31.3kHz
	CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
	cmsSound(11,0,0,atten[velocity],atten[velocity]);
	break;
	case 39: // Hand Clap
	CMS_SetRegister(cmsPort+2, 0x16, 0x10); // noise gen 1 15.6kHz
	CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
	cmsSound(11,0,3,atten[velocity],atten[velocity]);
	break;
	case 40: // Electric Snare
	CMS_SetRegister(cmsPort+2, 0x16, 0x10); // noise gen 1 15.6kHz
	CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
	cmsSound(11,0,1,atten[velocity],atten[velocity]);
	break;
	case 42: // Closed Hi Hat
	CMS_SetRegister(cmsPort+2, 0x16, 0x10); // noise gen 1 15.6kHz
	CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
	cmsSound(11,0,2,atten[velocity],atten[velocity]);
	break;
	case 44: // Pedal Hi-Hat
	CMS_SetRegister(cmsPort+2, 0x16, 0x10); // noise gen 1 15.6kHz
	CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
	cmsSound(11,0,0,atten[velocity],atten[velocity]);
	break;
	case 52: // Chinese Cymbal
	CMS_SetRegister(cmsPort+2, 0x16, 0x20); // noise gen 1 7.6kHz
	CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
	cmsSound(11,0,2,atten[velocity],atten[velocity]);
	break;
	case 55: // Splash Cymbal
	CMS_SetRegister(cmsPort+2, 0x16, 0x20); // noise gen 1 7.6kHz
	CMS_SetRegister(cmsPort+2, 0x15, 0x20); // noise ch 11
	cmsSound(11,0,0,atten[velocity],atten[velocity]);
	break;
	case 71: // Short Whistle
	case 72: // Long Whistle
	cmsSound(11,0,6,atten[velocity],atten[velocity]);
	break;
	default:
	cmsSound(11,0,1,atten[velocity],atten[velocity]);
	}
	}
	else
	{
	CMS_SetRegister(cmsPort+2, 0x19, 0x0);
	CMS_SetRegister(cmsPort+2, 0x15, 0x0); // noise ch 11
	cmsDisableVoice(11);
	}
	}
	else
	if (velocity != 0)
	{
	/*
	note_cms = note+1;

	octave = (note_cms / 12) - 1; //Some fancy math to get the correct octave
	noteVal = note_cms - ((octave + 1) * 12); //More fancy math to get the correct note
	*/
	NotePriority++;

	voice = MAX_CMS_CHANNELS;
	for(i=0; i<MAX_CMS_CHANNELS; i++)
	{
	if(cms_synth[i].note==0)
	{
	voice = i;
	break;
	}
	}


	// We run out of voices, find low priority voice
	if(voice==MAX_CMS_CHANNELS)
	{
	unsigned char min_prior = cms_synth[0].priority;

	#ifdef CMS_DEBUG
	debug_log("out of voice. NotePriority=%u\n",NotePriority);
	for (i=0; i<MAX_CMS_CHANNELS; i++)
	debug_log("%u ",cms_synth[i].priority);
	debug_log("\n");
	#endif
	// find note with min prioryty
	voice = 0;
	for (i=1; i<MAX_CMS_CHANNELS; i++)
	if (cms_synth[i].priority < min_prior)
	{
	voice = i;
	min_prior = cms_synth[i].priority;
	}

	// decrease all notes priority by one
	for (i=0; i<MAX_CMS_CHANNELS; i++)
	if (cms_synth[i].priority != 0)
	cms_synth[i].priority = cms_synth[i].priority - 1;

	// decrease current priority
	if (NotePriority != 0) NotePriority--;

	#ifdef CMS_DEBUG
	debug_log("find low priority voice %u, NotePriority=%u\n",voice,NotePriority);
	for (i=0; i<MAX_CMS_CHANNELS; i++)
	debug_log("%u ",cms_synth[i].priority);
	debug_log("\n");
	#endif
	}

	pitch = channelpitch[channel];
	if (pitch != 0) {
	if (pitch > 127) {
	pitch = 127;
	} else if (pitch < -128) {
	pitch = -128;
	}
	}

	notefreq = ((unsigned long)freqtable[note] * pitchtable[pitch + 128]) >> 15;

	if ((notefreq > 31) && (notefreq < 7824))
	{
	octave=4;
	while (notefreq<489)
	{
	notefreq=notefreq*2;
	octave--;
	}
	while (notefreq>977)
	{
	notefreq=notefreq / 2;
	octave++;
	}

	#ifndef DRUMS_ONLY
	cmsSound(voice,CMSFreqMap[((notefreq-489)*128) / 489],octave,atten[velocity],atten[velocity]);
	#endif

	cms_synth[voice].note = note;
	cms_synth[voice].priority = NotePriority;
	cms_synth[voice].velocity = velocity;
	cms_synth[voice].ch = channel;
	cms_synth[voice].voice = voice;
	}

	}
	else
	cmsNoteOff(channel,note);
	}


	void cmsTick(void)
	{
	#if 0
	unsigned char i;
	unsigned char noteVal;

	for (i=0;i<MAX_CMS_CHANNELS;i++)
	if (cms_synth[i].note != 0)
	{
	noteVal = cms_synth[i].volume-1;
	if (noteVal != 0)
	{
	cmsSetVolume(i,atten[noteVal],atten[noteVal]);
	cms_synth[i].volume = noteVal;
	}
	else
	{
	cmsDisableVoice(i);
	cms_synth[i].volume = 0;
	cms_synth[i].note = 0;
	}
	}
	#endif
	}

	void cmsController(unsigned char channel, unsigned char id, unsigned char val)
	{
	unsigned char i;
	if ((id==121) \|\| (id==123)) // All Sound/Notes Off
	{
	for (i=0;i<MAX_CMS_CHANNELS;i++)
	if (cms_synth[i].note != 0)
	{
	cmsDisableVoice(i);
	cms_synth[i].note = 0;
	cms_synth[i].priority = 0;
	cms_synth[i].ch = 0;
	cms_synth[i].voice = 0;
	cms_synth[i].velocity = 0;
	}
	if (id==121)
	{
	for (i=0;i<16;i++)
	channelpitch[i] = 8192;
	}
	}
	}

	#endif