I know the title sounds lame, we are bass players, right? But, I bought a Keeley Compressor Stomp Box (2 Knob) pedal a couple years back when I got my Alembic F-1X because my speaker cones were jumping out about and 1" or more,
I've used this pedal with my Alembic F-1X, Eden Navigator and now with my Aguilar DB750. I use it mostly as a limiter, not too much compression. But, this pedal ads some musical presence that when I turn it off, the three amps/preamps I mentioned sound blah or missing some life to the sound. Basically, it tightens up my sound and makes it have good punch.
The only down sound is, when on, you loss a little bass. Not much. So I just turn the bass knob on my amp to let say on my Aguilar, from 12 o'clock to 12:30 o'clock. Or my Alembic from 4 o'clock to 5. It's not much. One person wrote a review and said it was drastic. But, he was talking about the 4 know Keeley and it was hard for me to believe since it's the same pedal. The 2 knob has 2 trim pots inside. One trim pot is attack for basses with very high out put and the other trim is for input sensitivity.
So, if you're looking for a good stomp box compressor, check out Keeley. I don't know these people. Never talked to them on the phone, etc..... So this is not an ad.
I tried the T-Rex and the tube was microphonicing so bad, I couldn't us it Was very difficult to change the tube, and also too many knobs for me.