Re: Mark Bass amps?
I'm interested in the Mark Bass amps too.
I plugged into one at GC one time. I think it was the Little Mark Tube. I was able to dial in everything from a somewhat sterile but clean sounding solid state bass amp tone to a real rich, warm, tube tone using the VLE and VPF knobs. Very cool feature for getting different bass tones in a studio. You can certainly make a lot of adjustments at the amp, get a great recorded tone that's right for the song, and not have to fix it in the mix later.
I'm intrigued by the Randy Jackson model too. But I haven't seen one locally, so haven't been able to take a listen.