My group has converted to a power trio (we got rid of our drummer as, he keeps skipping practice and our bassist switched to drums and I have switched to bass. My question is how do we have the volume set while playing, I'm afraid that one of use might cancel the other out.

If it helps our guitarist uses a Fender Mustang with P90's, a Fender mustang amp, and a boss ds-1.

I haven't bought my gear yet but I know I am getting a Fender Rumble 500 amp, and my thoughts for a bass were a Danelectro longhorn.

I just would like to know what volumes each amp and guitar should be at, so we don't sound crappy, but just know we like it loud!