Just out of curiosity, are the people having problems with clicks using an external clock source? If you’re having problems with clicling loops and you use external clock, try switching to internal clock and see if that fixes it. That’s definitely not the only thing that can cause them, but it’s a likely one and I don’t see it mentioned much in conversations about clicks or sync issues.
I’ve never successfully gotten the OT to work reliably with any external clock at all, and one of the issues is that because even the most stable MIDI clock isn’t even close to sample accurate, ANY kind of looping audio has inconsistent pops and clicks at the loop point with external sync. Preumably dedicated loopers are all designed to not do this, probably they record a few hundred extra samples at the end of the loop and crossfade that with the start of the loop or something along those lines, but the OT doesn’t so it’s a lot more susceptible to clicks.
Pickup machines in overdub mode might have less trouble with this but I will never know because I don’t think I’ve ever gotten a PUM to complete one full loop with external clock before it gives an error and stops, and I’ve never been able to even start overdubing without an error.
If I’m in a situation where the OT can’t be the master clock, I don’t sync it a all - I send transport and tempo control from the actual master clock source to start it in time and then let it run free. It’s internal timing is so tight that I’ve started it from Reaper and let both run free for over two hours without any noticeable drift at all. Literally over 100 times (between streams and practicing I’ve done about 96 or 97 sessions like that in the duo I do most of my streaming with). The OT timing is as stable as any piece of gear I’ve used in my life, as long as it’s the master, but with external clock it’s really only OK if you don’t use flex machines for seamless loop recording or playback USING TRIGS (it’s the timing of the trigs jittering with the external clock that seems to be the issue, so playsfree tracks or endless loops that are started with a one shot trig and then run independent of the sequencer haven’t caused trouble for me), and don’t even think about pickup machines.
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