Sudden unwanted transposition


I am having an issue with playback. I have Dorico 3.5 on a mac, and use NotePerformer. While inputting notes or dynamics etc. all of a sudden one of the parts will start sounding a half-step up or down. I can solve this by resetting the playback template, but does anyone know why this might be happening, and how I can can solve it? Thanks, Nick

It’s most likely to be that another program is changing your sample rate. Edit > Device Setup, switch sample rate away from whatever it is and then back again, then Apply and Close.

If that doesn’t fix it, do you have any MIDI devices connected? If so, try disconnecting them and restarting Dorico. If the problem doesn’t reappear (with your MIDI device disconnected) you possibly have a faulty MIDI keyboard (or similar).

Thank you. And for solving it before I had finished typing the question :)).

Bad Midi keyboard problem., it seems.