While I have a pretty steady touch, I still wanted a compressor to make me as smooth as possible, BUT I did NOT want to hear any obvious compressor artifacts, 'pumping' or that 'leveled-flat' sound with no dynamics.
After studying several (was really headed for a DBX160A), I ran across a great steal on an Aphex 661, which had an automatic mode (handy for going back and forth between fingers, pick, and slap, IF it worked well) as well as a few APHEX circuits for their usual proprietary menu of expansion, big bottom-types of things, with a tube input circuit. And LED strips for bpth input and output. so I know EXACTLY where I'm at in adjusting levels. I'm running it through the tube channel efx loop on my Eden Metro stack.
Well, it works just fine! Built like a tank, a tube front end, invisible unless I dial in an obvious effect, which I don't. Kick it into bypass, there's NO sigh it's in the circuit at all.
For me, it just tightens things up a bit and smoothes things out just a bit. It REALLY firms up the low Cs and Ds, the lowend in general. It tends to 'save' the occasional 'almost-fretted-properly' note, as well as generally pulling up the occasional dead spots most all bass necks have.
I can live without it. But I prefer the sound with it, the notes seem to bloom just a bit better off the fingerboard. It's a subtle difference, which is just what I wanted.
J o e y