So, if I close anything that might play audio (even if there’s no audio playing) e.g. Spotify, Chrome with Facebook/YouTube/Soundcloud open, QuickTime, playback is fine again for a little while, but the issue seems to creep back up after a 20 minutes or so.
Then I have to quit my DAW, quit any current running apps, re-load my project and it’s back to normal for 20 minutes again. Rinse and repeat.
When the ‘garbled’ playback happens, it affects everything that plays audio on my Mac, so if I’m listening to Spotify and have my DAW open, Spotify will go fubar along with any audio playback in my DAW.
Helix is the only USB device plugged in to my iMac!
datacommando – I’ll give the new driver a try and see how it goes, thank you!
EDIT: Just to give a better description of how the playback gets mangled: it sounds like it’s been bitcrushed to death; super square distortion type sound making everything unintelligible, as well as harsh, choppy dropouts every 500ms or so.