The exact (and frankly really strange behaviour) is this :
- Connect Helix via USB, change system audio prefs to Helix so I can hear all system sounds through the headphone out on the Helix
- Test with a song in iTunes, plays fine.
- Start Logic, immediately, before logic has even fully loaded, the sound distorts.
- Haven't got as far as actually monitoring an audio recording from the helix, just tried playing back a midi drum track I had been working on so I don't think it's related to monitoring, the only track in the DAW is a midi track.
- If I then quit Logic and wait a few seconds, sound returns to normal.
I've made sure all my settings match yours, no difference.
I also get no sound with core audio disabled, should the Helix drivers take preference here i.e, if core audio is disabled, the drivers are in use? I'm not sure I understand this part to be honest.
I think i'm gonna try wiping the mac and rebuilding it, gives me an excuse to update it anyway. Very strange though.
Thanks for the help!