I've found that either though me tweaking it weird or though a botched update, my Teenage Engineering OP-1's mixer tracks 1 and 2 have become disabled.
When I go to the mixer screen, I can see track 3 in white and track 4 in red, but tracks 1 and 2 are faded to gray. The encoders still function and set the level of the track between 0 and 99, but the tracks are still dimmed and when in tape mode, on either track 1 or 2, pressing any key produces no sound. Though I can see the red vertical indicator going up and down with the sound and it's not capped mute for any of the tracks. Also the synth/drum mode icon still lights up for any of the tape tracks when pressing keys.
When in tracks 3 and 4, sound comes out of the OP-1 as expected.
Did I manage to misconfigure my OP-1 somehow? What do I do to reverse it?
I've updated to firmware 225 yesterday, but I don't see this being a firmware problem since it's been out for a while now and I think someone would have noticed there was a problem with it by now.