I've been writing aftermarket styles since version 4 (when they were first introduced back in the early 1990s) and if my memory serves me well:

Depends if you used "live drums" or not. The drum grid is backwards compatible, but the full MIDI set with resolution of 120ppq is not. The "live drums" feature came out in version 7.

I can't think of anything else in V10 that isn't backwards compatible at least to version 5. V4 had only 3 instruments.

Please correct me if I'm wrong.

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Bob "Notes" Norton smile Norton Music
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