I want to cover a song that's got very low frequency bass--one or two octaves lower than standard bass guitar tuning. My first thought was an octave effect, but the one on my Zoom B2 is not up to the task. I'm guessing that some sort of keyboard would be the way to go. Back in the day there were these things called "bass pedals" that were like a 13-key (or so) keyboard that you played with you feet for ultra low bass notes. They don't seem to be available now. So what would it take to emulate that with a small keyboard...on the cheap? Would something like an Akai Pro LPK25 be sufficient? Can it learn new voices? Does it have analog out that'll plug into a PA?