OT mono input jumps between channels

Elektron Gear Octatrack
1

My OT Mk2 that I bought last year has started to behave strange. Before contacting support, I wanted to check if anyone have run into something similar. Here’s my setup:

Behringer Pro 1 to Input A,
Summit mono to Input B,
Summit aux stereo to Input C & D

Summit midi out to OT midi in,
OT midi out to Summit midi in,
Summit midi thru to Pro 1

Everything works just fine initially, I use three thru tracks (inputs A, B and C D) to add effects and record audio. However, after turning off the OT and returning to it some hours later, channels A and B will drop out or get mixed up for two bars - e.g. the summit sound from input B drops out for two full bars (syncs with tempo, so slower tempo = longer silence) and can then be heard again for two bars, and so on. Once input B goes silent, if I change that thru track to listen to channel A, I can hear the missing sound there - I can even unplug that input A cable and listen to the summit (input B) while setting the thru track to input A.

I don’t rule out an error on my part, but I have no clue how inputs can be mixed up like that… Anyone seen this before?

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2

OT’s THRU LFO is always set to INAB (don’t get why) at start. I think you’ve likely nudged one of the LFO’s. Clear your LFO page or just zero them out. That’s my best guess.

3

Sounds like a midi cc is coming into OT maybe?

You have a midi loop going between Summit and OT, that is never a good idea.

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4

Thanks for the replies, looks like it’s a combination of both your suggestions! I managed to reproduce the issue - when I have the OT powered on and start my Summit, the LFO 2 Depth gets nudged from 0 to 1, I guess some midi cc is sent when the Summit starts. No issues if starting the Summit before the OT.

I’ll see how it works out without the midi loop - I know it can cause problems, but I haven’t had any issues for almost a year.

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