I was getting ready to tell you how important it was to change the internals from the factory setting.... only to open my pedal up to find that I'm a hypocrite. I finalized my internals setting in fairly dark room with only the TV on while listening thru headphones. Turns out it's pretty much factory settings. All this time I thought I came up with something magical.
Your settings are going to be depended on how strong the signal is going into the pedal so what works for me and my bass may not for you. That said here are mine with a fairly bright'ish J Bass with Lollar single coils-
Tone- Fully Clockwise
Overdrive- 2:00+/- depending on the room and song
Curve- Full Clockwise
All internals are pretty much factory except the Filter is @ 5:30 -6:00 to add bit of low end and tame the top end ever so slightly . The Filter is a really cool knob; Full counterclockwise for the most high end snarl (RATM type tones) and fully clockwise more a old school Noel Redding thing with more lows. I think the closer I am to fully counter clockwise the more it sounds like my original signal.
When running after a envelope filter for synth type tones or to get more of a fuzz tone l I roll the Curve knob way back and may even back off the Clean knob to noon.