Update: I spent some more time with the broken project file today, and the actual behavior is:
After loading the project, the first time I start recording on any pickup machine (today it was on track 8, I think it was track 6 last time) it will record normally, go into overdub normally for one cycle of the current pattern, and then as soon as it starts the second cycle in overdub this happens:
1 - it starts to alternate between record and overdub. During the first half of the pattern it will be in overdub, but during the second half it will switch to record and the audio will cut off. When it loops back to the beginning of the pattern the same thing repeats - it goes back to overdub mode and plays the audio that was recorded WHILE IT WAS IN RECORD DURING THE SECOND HALF OF THE PREVIOUS CYCLE, and then when it hits the middle point of the pattern the audio stops and it goes back into record mode.
And then after 3-4 times through the pattern doing this, there’s a fairly loud pop and audio from theat PUM stops copletely. Also the space where the little play/rec/etc. status icon should be goes completely blank. All other tracks behave normally and pass audio.
The previous version of the project doesn’t do this at all, even though NOTHING IS DIFFERENT - the only difference between the two versions are some changes in part B, but the bug occurs in part A which is EXACTLY THE SAME in the working and broken versions of the project.
It’s very consistent and I was able to replicate it easy (just start recording on a pickup machine and it happens every time). The only thing that’s not completely predictable is how many cycles it takes before it completely stops working, but it’s never more than 4 or 5, usually less.
It’s absolutely tied to the specific project file, so it must be corrupted even though it loads normally with no error messages or anything. Thiss actually the third time since I got the OT that I’ve had a project file get corrupted in some way but still load normally The first time, in 2018 or 19, some of the patterns were moved to different patten slots and banks; the second time I loaded a project from the card and the track 5 record parameters were completely different than they were when I saved it the day before. In all cases, recreating the project from scratch (or loading an earlier version and redoing every change that I’d made before I saved the version that didn’t work right) fixed it. Definitely tied to the file itself.