I had a similar problem a while ago before the os 1.1 update, track 1 wouldn’t trigger sounds from the sequencer, though it would still play from a keyboard. The sounds became completely unstable on all channels, not just pitch but the other parameters as well. The status indicator light on track one was dimmer than the other chanels.
I’m pleased to say this all got sorted with the os 1.1 update. It seemed the project file had become corrupted. I created a new blank project and everything workes perfectly. I can still load the old project file and the erratic behavior returns.
Hope this is of help