random MIDI program change errors

[azimuth124]

Hi All,

I'm mid rehearsals here, and I'm getting the occasional MIDI program change errors going to guitar rigs and other gear.

It will sometimes happen at the end of a chunk, going into the next chunk. In these cases, the next chunk does NOT have a default patch. Default patch is CLEAR.

In other cases, I'm getting random program changes being sent to gear mid song, where there aren't even any program changes written into the track.

Any help would be most welcomed.

thanks.

DP9
express 128 through XT
macbook pro 15" early 2015
yosemite
10.10.5