Here's my report if anyone's interested:
Small, well padded studio. Not completely dead, but no LF problems.
Two guitarists playing through small Fender amps that I was unable to quickly identify (meaning they were new; I only recognize the vintage ones, like well, because I'm vintage). One playing what looked like a Mustang with Tele pickups and the other playing an unidentifiable electroacoustic.
Singer miked. Me, using my Gretsch G5123B strung with LaBella 760s, playing sometimes with a pick but mostly with my fingers. This bass puts out a lot of low end.
Tunes were 60's country standards arranged for the instrumentation. I had to play from '60s pop style (my natural habitat) to imitating a stand-up to comping tic-tac.
Best setting was bright on, contour off, vintage off. Vintage on was just too much low end with this bass in this setting. EQ was just a little off from flat with bass at 10 o'clock, low-mid at 11, hi-mid at 12, treble at 2. Gain was interesting - I had been forewarned that gain on these amps doesn't function simply as a normal gain control but involves some form of limiting or compression at the higher end. Gain at about 2 seemed to work best for me. Amp was plenty loud.
To be honest, I'm pretty impressed - you could do far worse in a little amp - this thing has got to be the lightest combo I've ever played and it sounded great in this setting. I felt that my 64 Ampeg B-15N must weigh about 5x as much and although it sings in other genres, it wasn't as percussive enough when I used it with the trio at a previous rehearsal.
