Turns out that the volume adjust works track-at-a-time, not in sections, so it replaces the need for vPitcher, at least while converting. vPitcher might still be useful, as a quick and dirty tweak for ABC files by others, as it doesn't re-write the header, like Maestro does.
I tried mixing down a multi-part midi to a solo lute, and adjusting volumes so that the rhythm guitar and bassline tracks lowered, and the melody line boosted. Interesting result. I think it sounds okay, but there are a BAZILLION expression change notations in the file (naturally), which cranks up to +ffff+ on a melody note, and drops to +pp+ on rhythm notes and +mf+ on the bassline. I need to listen to it in game more to decide if I hear the wavering, or if I *think* I might.
I'll put a "Demo" folder in my dropbox with the midi and the resulting ABC. I'll use that folder for other stuff I do experimenting with the systems.