Hiya Deane...

It's perfectly possible. (I assume you are talking about performances) First Goto to your existing performance list, then press performance list again. This takes you back to the page where you see the groups of performances you have created, and will show music assistant at the top of the page. Select the group where the performance you wish to delete resides, then rather than choosing load from the next screen, press edit. [ensure you don't choose delete on this screen as this deletes the whole performance list!!!!!!] From there you will see a list of your performances in that folder. Select the one you wish to delete then choose 'delete.'

If you want to get rid of a midi file or audio file, just put your USB key into a computer and delete it using the PC. There doesn't appear to be any problems with doing this on the BK-7m. The G70, E80 etc had a 'finder' system on them which required a checksum stored on the memory card. If you edited the song list in windows explorer, the checksum was then incorrect meaning that while all the songs were still on the memory card, the keyboard wouldn't show them. Roland have removed the 'finder' and instead let us organise files into the folder we want ourselves. I find this a much better way to find the things I want quickly.

Hope this helps,

John