At this point it would be best to contact support@eventideaudio.com for further troubleshooting. After you explain the issue, point them to this forum thread so they can see what we’ve tried. While you wait for a response, I would try some other things to rule out a hardware problem with the H90
- Do you have another device you can connect to the H90’s I/O 3&4 like a synthesizer or a drum machine? I would try to see if the H90 passes stereo audio through with another device. You could even bypass using your mixer’s send/return loops and go Master out to H90 and connect that to a PA. If it does not pass stereo audio through I/O 3&4, it’s a strong indication it could be a hardware issue.
- If you have not created any custom Programs or presets, conduct a factory reset of the H90 to see if it clears things up. Maybe there’s some internal settings I’m forgetting to check. You could back up your Programs then try the reset. After the reset, go back into Dual Mode to test out I/O 3&4 again.
