I have yet to fix this problem I have been using my Presonus AudioBox 22VSL for years in Logic Pro now. Never had any problems I love this device so much, but this week for no apparent reason it stopped outputting in stereo. There's no options that I can control within Logic and I can't change any parameters on the very limited app Universal Control. What the hell is going on, I've seen many others online with the same problem and no solution..