Noel: That's encouraging - Thanks. I have Reaper, but have never had cause to use Project Settings/Pitch Shift. (Ok, hands up: I didn't know it was there....)

Matt: I'm interested in your comment on Natural Extensions. 'What's New' says: <<...with fancy extensions...the musician may reinterpret these rather than playing them exactly as written...Now you can get Band-in-a-Box® to do the same thing>>

What do you think BIAB is doing with Natural Arrangements? Ignoring upper partials and simplifying the chord? Changing upper partials? Deleting some (eg changing an alt to #5#9) Improving voice-leading? Changing roots even? Is it only the chordal instruments piano/guitar whch are naturalised... ?

Thanks again to both of you. Best - Andy