Skyline_UK
CWBRN-22566 still not fixed (when a standard MIDI file is saved from the project with muted tracks the muting status is ignored and the resulting file has all MIDI tracks). This bug was introduced in X3d...
You sure about that? I just did quick check of this in 8.5.3 and X2a, and they didn't honor MIDI track muting either. And it's not advertised to work that way in the Ref. Guide AFAIK, so it's hard to see it as a bug. Since the way you get MIDI out of SONAR is by using Save As, it doesn't really surprise me that muting doesn't cause tracks to be omitted. That would be contrary to the general concept of "Saving".
The workaround would be to save a copy of the project with muted tracks omitted or bounce the active tracks to a new track and drag the new clip out of the project to "export" it.