I've always been a bass-cable-amp guy, although, I've been using a compressor lately for some squished slap parts only.
Um, it's a volume pot...so, now I have two.

One on my bass and this thing. I guess I could use it for swells at the end of songs maybe? Is this one of those "if you have to ask......" things?

Other than using it with my passive J's that have vol/vol/tone, I can't wrap my mind around it. I mostly play my SR5 and Sadowsky 5, which have single volume pots.
Unfortunately, my wife got it for me so I'm trying to resist the temptation to send it back to MF. Cr@p.
What do you guys do with yours? Thanks.