Valis II patch: 2nd PSG is too loud

[sdsnatcher]

The 2nd PSG support allowed the game to finally have sfx+drums at the same time.

But the 2nd PSG is so loud that this advantage is barely noticeable. Probably the original game has setup the sfx very loud so it would disguise that drums were being disabled.

To make the 2nd PSG support better, the sfx volume must be lowered considerably.

[sdsnatcher]

I checked and my original v1.1 of the drumkit patch already had fixes for the sfx volume, also including some enhancements of the sfx.

Apparently, this part is not working when the 2nd PSG is enabled.