VERA: 4x the volume

src/engine/platform/vera.cpp

@@ -372,6 +372,10 @@ void DivPlatformVERA::muteChannel(int ch, bool mute) {
   }
 }
 
+float DivPlatformVERA::getPostAmp() {
+  return 4.0f;
+}
+
 bool DivPlatformVERA::isStereo() {
   return true;
 }

src/engine/platform/vera.h

@@ -66,6 +66,7 @@ class DivPlatformVERA: public DivDispatch {
     void tick();
     void muteChannel(int ch, bool mute);
     void notifyInsDeletion(void* ins);
+    float getPostAmp();
     bool isStereo();
     void poke(unsigned int addr, unsigned short val);
     void poke(std::vector<DivRegWrite>& wlist);