Hi everyone - I am using a P90 guitar for a heavy doom & blues band and having a tough time getting my rig to deliver a deep heavy tone. I'm using a Crate Power Block for rehearsals and have a wide range of overdrive / distortion pedals to help shape my sound. My cabinet is a 4x12 converted Ampeg combo (head removed a long time ago) from 1974. The speakers are CTS. Any suggested settings or tips/tricks on how to get a deep, rich sound of the p90s with my current rig? I suspect it's a matter of sitting down and messing with the dials for an hour or so... but I'd like some insight from others.