Attach drum/bass/other volume levels to the song

You should enable us to set the volume levels for each instrument for each song. For some songs I want a lower drum or bass (or other instrument) volume and for others a greater volume. As it is, once volume is set for the 3 instruments, that holds true for all song. It doesn't seem like a greatly difficult programming feat to add that volume link to each song just as you now do with instruments, tempos, etc.

A very easy alternative would be to simply have silence as one of the (sticky) accompanying instruments - for both the bass and the treble. That should be easy to do and would keep me from having to silence an instrument from one song to the next.