My main instrument is electric bass, but I play a bit of keyboards as well in a cover band. Most of the time I run my keyboard rig (Hammond SK-1 and Moog Minitaur) the through the PA. Occasionally, however, I need to run the keyboard rig through a backline amp. I was contemplating acquiring a Peavey Mk III or Mk IV amp mostly because they are high-powered 2-channel amps which would allow me to backline my electric bass and keyboard rig using only one amp/cabinet. The two pre-amp and and single power amp circuits of these amps seem identical (with the exception of the bi-amp crossover and compressor features of the Mk IV). I was looking for opinions from anyone who has had experience with either or both of these amps. I'm not into bi-amping so that particular feature of the Mk IV doesn't matter to me (but a nice option to consider in the future). However the compressor circuit seems interesting since there is occasional output difference when switching keyboard patches. Is the compression circuit 'always on' or can it be bypassed? How does the tone of the power amp section compare between the Mk III and Mk IV? Remote footswitch: Does using the standard Peavey remote footswitch cause any noise (i.e. clicks/pops/etc) when actuating the push button switches? Any quality/reliability/service issues between the Mk III and Mk IV? NOTE: Please refrain from suggesting other bass amps or PA powered mixers (I have several of each already). I am interested in feedback/opinions of the character of these two vintage Peavey bass amps only. Thanks.