Cubase randomly transposes MIDI

I made a Chord Track based on my guitar parts (Charts)

Dragged Chord Track to Halion Sonic instruments and they worked perfectly several times through

For no reason at all, one of more of the parts automatically transposes itself up or down 1 or 2 semitones.

Any ideas how to stop this?

Hi,

Are you talking about MIDI Parts (Instrument tracks) or Audio Parts or Events (Audio tracks)?

MIDI parts from the Halion Sonic plugin. You drag a chord track into it and it’s perfect for a while and then all of a sudden it just flattens…

Hi,

Does the track follow the Chord Track?

Yes … but totally transposed … usually a semitone flat. It sometimes does it in the middle of the track so it starts at the right pitch then just drops half a step.

Hi,

Do you have Transpose track involved by any chance? Or is the MIDI Part transposed?

Nothing. It is a random change. I can play through once perfectly and on the 2nd play it changes…