C140: VGM volume

src/engine/platform/c140.cpp

@@ -398,6 +398,10 @@ int DivPlatformC140::getRegisterPoolSize() {
   return 512;
 }
 
+float DivPlatformC140::getPostAmp() {
+  return 3.0f;
+}
+
 const void* DivPlatformC140::getSampleMem(int index) {
   return index == 0 ? sampleMem : NULL;
 }

src/engine/platform/c140.h

@@ -77,6 +77,7 @@ class DivPlatformC140: public DivDispatch {
     DivDispatchOscBuffer* getOscBuffer(int chan);
     unsigned char* getRegisterPool();
     int getRegisterPoolSize();
+    float getPostAmp();
     void reset();
     void forceIns();
     void tick(bool sysTick=true);