miden.... the reason the bass pattern does not move is that it is set to not transpose, while other parts DO....

In fact, this is one of the main hiphop based functions that ordinary arrangers rarely are capable of - in essence, using a Drum Track for melodic sounds, so they do not transpose when you change the chord. I have NEVER seen why this simple ability cannot be introduced into regular arrangers (after all, it's simpler to implement than transposing a track), a Transpose/Drum Track switch for EVERY Part, sort of a super Hold function....

Little things like this would go a long way towards making regular arrangers at least capable of hiphop production.