just messing around with the drum utility myself over here.
seems like most of the stuff works fine for me.
i can remove slices and save and its not there anymore.
i can remove and replace slices and that seems good.
settings seem to persist from iteration to iteration
granted i’m not loading them onto my op1 and fully testing
i get the repeated slices if i remove a slice and save then reload into the drum utilty
maybe thats intended behavior? afaik u can’t like have an empty slice maybe?
u could always have a small silent audio file
and just place that in there when u want an empyt slice
u can get at the header if u open the .aiff file in a text editor
this might be a good place to start for editing the params…