Further to Matt's questions, does it do this on all songs, some songs, only MIDI songs?

Does it do this after you press Play, or after you load the song, or after you make some other change?

Are you using an external MIDI device or internal?

After you changed to RealDrums did you regenerate before you got the message?

More information obviously helps reduce the guesswork that others need to make to assist you.



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