If you look at the circuit of my base,
I can adjust the gain of my front pick-up and rear pick-up, but the other hole is blocked Can I know what this is? It's attached to the treble knob
can I open it?...?

http://alembicguitars.net/club/messages/631/35650.html?1171652197 It's this model

I've seen this too, in one of my basses. Is it on the treble pot of my Custom fretless maybe? Anyway, I took it to mean- "don't adjust this trimpot" and didn't mess with it. I'll take a look here in a little bit.


Whether tweaking it would do any harm is a question for Mica or the Wizard probably.


Nice bass!

Because the standard bass and treble module also includes a preamp, it's turned all the way down in this configuration and you only use the preamp associated with each filter.

And yes, Greg, it's an invitation to keep yer paws off of that trimmer

oh i see!  Thank you, everyone!
i love my bass