From your prior posts, it doesn't sound like you're a BiaB owner yet. So that rules out using BiaB.

I've been able to find decent basses on Craigslist for around $100 by waiting around and knowing what I wanted.

If you are a guitarist, it's not that difficult to play a full-size bass. But might consider something like the Ibanez Gio MiKro bass. It's a short scale bass that I find is fun to play, and it's a bit easier to fret if you're just starting out.

-- David Cuny
My virtual singer development blog

Vocal control, you say. Never heard of it. Is that some kind of ProTools thing?