MPC 2500 Question

Can you turn down the volume of the metronome on the mpc , mine is way to loud , ?

I can't find how to do that either and I think that it can only be done with the JJ's OS...Not sure though.

You can only turn it on or off I think. Apart from that you could make a dedicated track with a sound you want, put that on the 1s and 2s, and let your sequence run through that once before recording the real sounds.