JJ OS problem with metronome

So iv been using my MPC2500 for about a year now and have had no problems. but 2day i installed the new JJ OS and now i cant hear the click (metronome) anymore. sumtimes it komes bak but it gets really soft then really loud....anyone have any ideas

there should be a tc/click f-key from the MAIN screen. from there, one of the f-keys should allow display of the click options where volume amongst other things can be set. This is how it is on the Mpc1000 JJos2 anyway, perhaps it differs slightly on your setup

Hold Erase while loading up the MPC after loading a new OS, otherwise who knows what it is thinking it is going to try and do.