Well, it turned out they just wanted to plug me into the house through my pickup, they only had enough mics for the other instruments. The sound guys did, however, tell me that I should have my own mic for things like this, and gave me a list of mics they like. One of them (a red haired dude that went by the name of Sharpie, I thought that was pretty funny) showed me how to dial a good bass sound on my Polytone. I'm actually not all TOO picky with my sound, since the first problem I have was being able to hear myself. That wasn't a problem at the gig, because when I thought I was too loud, the director wanted me twice that volume.
I put my volume pedal in, because I didn't want my bowing to be too loud. That was interesting, because it's the first time I've actually used it on a gig with my upright. And it was very comfortable to sit at the stool, one foot on my footstool and the other one on the volume pedal. It was actually very natural to use it this way to help with dynamics, rather than standing with it at a slab gig.
There was a few issues I personally had with the sound. It was with my bow. There was a lot of "twang" in my sound, ESPECIALLY with my open strings. It's not that bad unplugged, though I could use some more practice with a bow. However, I was wondering if that would be due to the bass being plugged in, or if it's the fact that I'm using the D'Addario Hybrid strings. I've heard from classical bassists that the company used to make good strings, but that they aren't that great any more for professional playing. Then again, McBride uses them.
Oh, and Fdeck, I used your HPF at the gig, and the sound guys loved it. They said it made a world of difference plugged into the house compared to the guys that don't have one.
This is how the chain went:
My Kay with the Hybrid strings
Fishman BP-100
HPF-Pre
The house DI box
Boss FV-50h
Polytone Mini Brute III
Nick