I tried all different variations. MacBook with and without charger, devices with batteries and devices with PSUs. Doesn’t seem to make a difference sadly…even tried a USB isolator instead of the ground isolator suggested by TE. The german repair shop that is designated for TE repairs said it could make a difference - but it didn’t…I’m wondering if it’s worth getting another connector board and swaping it to see if that helps.
This is what it sounds like:
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I have the same issue too, hence why I’m still on version 242.
I suspect this issue is probably due to TE devs not fully/correctly considering variations/tolerances between units chipsets and processors.
Just speculation though, but that’s my guess…
Another example of this are DNA synth graphics,
on some units they appear to be offset from center (my unit does),
and as we know those graphics are tied to CPU id…
So makes me think it could be a similar issue.
Here is a list of anomalies between different revisions of the CPU inside the OP-1
I hope this not to be the case, and really hope they fix this…
But who knows!
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Yeah - I thought of that too. I have REV 2 (the one with the “peace”-sign on the back). I thought maybe it has to do with that. One thing I figuered is that the whole idea of using a isolator to get rid of the clicks is bs since the clicks and pops also appear when using the internal microphone 
if the clicks and pops would be caused by the external source on the line-in, the microphone of the OP-1 should work fine. But it doesn’t.
Anyway I think it’s insane that they’ve released firmware 243 as a stable version without proper testing of their different hardware revisions and especially newer revisions… 
It’s not small issue too, it makes the device totally unusable unless you like to have random glitches all over your recordings… What a shame!
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