Just adding my problem to the list here. I'm an audio producer so always hesitant to update to a new OS. finally updated to Monterey 12.6. Playback through my aggregate device is completely distorted when I play anything from Spotify or through a web browser (youtube, etc) I don't experience the problem when working in Logic Pro, or when playing audio files saved locally. My temporary workaround has been to change the system sound settings output to a single audio device, rather than the aggregate, to listen to Spotify. This is less distorted, but actually still sounds pretty terrible, I think it's in mono actually. I'm at a loss, not sure if I should roll back to my previous time machine backup or... deal with it? In any case, I can't believe there hasn't been an update to address this issue - it's a BIG ONE! iMac (Retina 4K, 21.5-inch, 2017) 3.4 GHz Quad-Core Intel Core i5 Aggregate Audio Device: Universal Audio Apollo x8, Focusrite Scarlett 18i20