nesdev.org

Maybe SNESGSS will do the trick?

https://code.google.com/p/snesgss/

On my end, I don't use that sound driver (at least for its traditional use: through the application) due to a platform incompatibility. However, I have assisted with its implementation in Furry RPG, and I fooled around with the sound driver by hex-inserting a test song.

Tried out the new Tetris and it works perfectly. Thanks! Can't really comment on how the L-hold-delay feels though as I'm not used to that feature.

Looking forward to seeing the next game!