Hello David and Marcus,
Had any software or driver updates been installed on your Macs when the problem started happening?
Please also:
- Check that all macOS power-saving features are disabled, such as 'App Nap' (a.k.a. 'Power Nap'):
https://www.lifewire.com/control-how-ma ... ap-2260788- Try keeping the audio and MIDI interface(s) connected directly to the Mac (not via a USB hub, for example).
- Run Apple's hardware diagnostics:
https://support.apple.com/en-us/102550- See whether the problem occurs if using the Mac's built-in audio output for Hauptwerk (instead of your usual audio interface).
- See whether the problem occurs using St. Anne's.
- See whether the problem occurs if instead using a 'spare' one of the "
Hauptwerk (alt config N)" configurations (desktop shortcuts) with all-default settings (e.g use "
File | Revert all Hauptwerk settings to factory defaults"), except select the Mac's built-in audio output, and have no MIDI IN ports at all ticked/enabled (just click on virtual stops and keys for testing) and no MIDI OUT ports at all enabled. And/or try using solely a different MIDI interface if you have one (connected directly to your Mac -- not via a USB hub).
Best regards, Martin.
Hauptwerk software designer/developer, Milan Digital Audio.