Namco WSG: fix noise mode

doc/4-instrument/wsg.md

@@ -11,7 +11,7 @@ this allows you to enable and configure the Furnace wavetable synthesizer. see [
 - **Volume**: volume sequence.
 - **Arpeggio**: pitch sequence.
 - **Noise**: specifies noise pitch.
-  - only applicable for Namco C30, and even so, only on the last 4 channels.
+  - only applicable for Namco C30.
 - **Waveform**: specifies wavetable sequence.
 - **Panning (left)**: output level of left channel.
   - Namco C30 only.

src/engine/platform/namcowsg.cpp

@@ -201,7 +201,7 @@ void DivPlatformNamcoWSG::tick(bool sysTick) {
     if (chan[i].std.vol.had) {
       chan[i].outVol=((chan[i].vol&15)*MIN(15,chan[i].std.vol.val))>>4;
     }
-    if (chan[i].std.duty.had && i>=4) {
+    if (chan[i].std.duty.had) {
       chan[i].noise=chan[i].std.duty.val;
       chan[i].freqChanged=true;
     }
@@ -418,6 +418,7 @@ int DivPlatformNamcoWSG::dispatch(DivCommand c) {
     }
     case DIV_CMD_STD_NOISE_MODE:
       chan[c.chan].noise=c.value;
+      chan[c.chan].freqChanged=true;
       break;
     case DIV_CMD_PANNING: {
       chan[c.chan].pan=(c.value&0xf0)|(c.value2>>4);

src/engine/sysDef.cpp

@@ -1708,6 +1708,10 @@ void DivEngine::registerSystems() {
 
   EffectHandlerMap namcoEffectHandlerMap={
     {0x10, {DIV_CMD_WAVE, "10xx: Set waveform"}},
+  };
+
+  EffectHandlerMap namcoC30EffectHandlerMap={
+    {0x10, {DIV_CMD_WAVE, "10xx: Set waveform"}},
     {0x11, {DIV_CMD_STD_NOISE_MODE, "11xx: Toggle noise mode"}},
   };
 
@@ -1741,7 +1745,7 @@ void DivEngine::registerSystems() {
     {DIV_CH_WAVE, DIV_CH_WAVE, DIV_CH_WAVE, DIV_CH_WAVE, DIV_CH_WAVE, DIV_CH_WAVE, DIV_CH_WAVE, DIV_CH_WAVE},
     {DIV_INS_NAMCO, DIV_INS_NAMCO, DIV_INS_NAMCO, DIV_INS_NAMCO, DIV_INS_NAMCO, DIV_INS_NAMCO, DIV_INS_NAMCO, DIV_INS_NAMCO},
     {},
-    namcoEffectHandlerMap
+    namcoC30EffectHandlerMap
   );
 
   sysDefs[DIV_SYSTEM_MSM5232]=new DivSysDef(