Moved master volume as a final pass before passing it to the driver

src/audio/synthesis.c

@@ -1496,11 +1496,6 @@ void note_set_vel_pan_reverb(struct Note *note, f32 velocity, f32 pan, u8 reverb
         velocity = 0;
     }
 
-
-    float master_vol = CVarGetInteger("gSettings.Volume.Master", 100) / 100.0f;
-    volLeft *= master_vol;
-    volRight *= master_vol;
-
 #ifdef VERSION_JP
     note->targetVolLeft = (u16)(velocity * volLeft) & ~0x80FF; // 0x7F00, but that doesn't match
     note->targetVolRight = (u16)(velocity * volRight) & ~0x80FF;

src/port/Engine.cpp

@@ -400,6 +400,12 @@ void GameEngine::HandleAudioThread() {
             create_next_audio_buffer(audio_buffer + i * (num_audio_samples * 2), num_audio_samples);
         }
 
+        float master_vol = CVarGetInteger("gSettings.Volume.Master", 100) / 100.0f;
+
+        for (u32 i = 0; i < SAMPLES_PER_FRAME; i++) {
+            audio_buffer[i] = static_cast<s16>(audio_buffer[i] * master_vol);
+        }
+
         AudioPlayerPlayFrame((u8*)audio_buffer, 2 * num_audio_samples * 4);
 
         audio.processing = false;