Creating internal send effects with track recorders and flex machines - need advice

I’ve been experimenting with creating an aux send type setup in the OT and I’ve actually gotten pretty close, but I’ve hit a weird behavior that I can’t figure out.

The way I have my project set up so far is:

-Cue set to studio mode.

-Track 8 is my aux send. The track recorder is set to record from cue. I have record and playback triggers on step one, so that I immediately hear whatever is going into the track recorder.

-The cue level for track 8 is set to zero to avoid feedback.

When I put a delay (with DIR on zero so I’m only getting the delayed signal) on track 8 it works as expected, I can use the CUE level on other tracks like an aux send into track 8. The problem happens when I use dark reverb - even though track 8 has its cue output set to zero, I get feedback. Not nearly as much as I would with the CUE level turned up higher but it’s definitely there - even with the reverb time on zero, it will slowly build up into an endless wash of reverb feeding back on itself. Basically, it’s acting like even with the CUE level set to zero, a little bit of the audio is still bleeding into the cue and being fed back into the track recorder.

Also, I get a lot of phase cancellation with the dry signal, that’s very apparent if I adjust the reverb predelay or the microtiming of the playback trigger - it sounds like even at 100% wet there is some dry signal in there. I can’t find any information in the manual about whether or not Mix at 127 is fully wet or not but I assume it is supposed to be.

I’m not using any scenes or plocks or anything that might be changing the parameters without me realizing.

So it seems like I’m either missing something obvious or misunderstanding something about the signal flow in the OT but I’m stumped right now. Any ideas?

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Have you tried each of the two mixf parameter settings in the reverb setup page?

Oh, and nice idea…

Yeah, and I also tried putting the playback flex machine on a different track from the one that was recording just in case, but no luck.

On the bright side, it’s a very musical sounding feedback, kind of builds slowly until eventually it starts to whistle a bit, but it sounds more like sympathetic vibrations than like mixer feedback or something.The downside is that even with the reverb time all the way down it takes a few seconds to actually decay.