Red Rooster trim pot

[The Captain]

That setting could be highly dependent on the tranny used. Probably best if the Captain chimed in on this one.

Yes. Don't rely on a visual setting. The trimmer in the Rooster is to set the bias on the transistor to a particular voltage (6.1-6.66V) It shouldn't need messing with really unless the pedal starts to sound like its farting out.

[Luca]

Thanks David,
I don't know if the pot has been re-set, because I bought it used (I tried to buy new, but I couldn't).
I don't notice a farting sound, but I wanted to be sure that it is set at its best. Is it easy to check that voltage using a multimeter?

[skybone]

bias on the transistor to a particular voltage (6.1-6.66V)

So that's why they sound evil...

[fuzzer]

Is it easy to check that voltage using a multimeter?

With a new Battery you should see said voltages when measuring from the Transistor's collector to ground (Which in this case would correspond to the positive Battery pad). The reading will be negative.