Derek Ladkin and I have been looking at some KN5000 stuff that he recorded and found that where certain sound edits had been used with the original KN5000 song, it was not possible to properly play the song with the KN6000/6500. This was caused by a different technical approach to sound editing with the KN6000. Maybe Alec can elaborate on this. Where the rhythm used was first placed in the composer and sound edits were not used, the songs seem to be OK. This should also be the case with the KN3000.