Hey Dave, if you’re using a single mono out on the BB, try the other output jack (ex: if using the left out, try the right out). Perhaps the instruments you’re not hearing are panned in such a way they are on the opposite side of the output you’re using which may not be noticeable in BBM.
The reason I’m suggesting this is an issue that I posted back a few years ago as described in the thread link below. Whether your problem is related/similar I don’t know and I ‘think’ this was addressed and fixed in a firmware update. The Left/Mono out should work properly on drumkits created by SS.
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