As promised, here is some audio of the Ibanez Bottom Booster.
The progression is bypassed, then the BB9 engaged at various gain and tone levels. It only has three knobs - GAIN/TONE/VOLUME. The signal was my 62RI Jazz (played with a pick) into an Ampeg PF800, into a Palmer Junction PDI-09 Speaker Simulator (to take the harsh edge off of the Ampeg direct signal) into Garage Band with no EQ adjustments. I made up a cheesy riff and didn't play it correctly every time, but that's what it is...
It's a cheap pedal with a noisy switch, and I'm usually using it as a boost and a slight beef-adder to my tone for certain sections with a medium gain push and the tone pushed a little forward, but there are some other tones available with it. Personally I like what it does. You can decide for yourself.