Thanks for the replies.
As for the synth question, it's a pre-set combination of patches and effects in Reason called "Flea Slap Bass" or something similar.
I've always done most of my work other than vocals and trombone in Reason, but on this project I'm looking to move away from electronic/industrial style and mix in some more natural-sounding stuff. That plus the fact that this song is built around the bass part made me wary of using a synth bass, although that usually is good enough. Which is what brought me to this point. I found some amateur guitarists who would collaborate for credit and some money for a couple of guitar solos, but no such luck with a guest bassist.
Anyway, it's hard to judge these things for myself, so thanks for the feedback. I'm about half-way through the fake-to-real process now
