When every band member has gotten what they individually need (the cat mask, the broken mirror, the travel guide) they are supposed to play a short (but chaotic) tune. After that you should be able to pick up the metronome by talking with the Drummer. But something might be wrong! i will look into it🙂
I managed to replicate the bug! It has something to do with the order of how you disable the power cabinet, so you are the first one to get that one. I'll put up a fix tonight, with some other small stuff fixed as well! You might have to load a little back (like the end of act two in the desert) for it to work properly :-(