Delete unused drumsets

is there a possibility to find out in which songs a drumset is used?

Yes, but maybe not the answer you want… if you go into Drum Sets in Beat Buddy Manager and untick the blue tick-box next to a drum set, then go back into your Songs, every song using that Drum Set will have a tiny asterisk next to the “Default Drum Set” named Drum Set in each song using that Drum Set.

this i already knew. But its a problem when you have something like 400 songs on your BB

Anyway thank you