Maybe not part of the original topic, but one thing the drives me nuts with GEQ's is the bands are typically not set in places that work well for me - for instance, I used to have one where it went right from 500Hz to 1kHz... Really no in-between? I'd rather have a four band EQ with the bands placed in more usable locations for me (for example: 80Hz, 220Hz, 800Hz, and 2kHz).
Think of these as tools for cutting rather than boosting. I doubt you listed these frequencies because you want to cut them out.
Sliders are good for stereos, PA's anything full range. IMO toys on a bass amp.
Faders are only toys when you call them sliders.