Having some clicks/cracks on one channel of mixbus comp

Super thanks for chiming in (was kinda hoping for you to do it at some point, as you seem to know this stuff ). I will do that immediately and report back how it played out.

Huge thank or you also to chime in. I just finished off a testing round with following results. I don't really have other sources to push thru at the moment than my inteface. BUT I came up with something that might help further.

- I took out the tubes and reset them a couple of times, tried to feel for and see loose connections, but all seem normal. 

- Since my mixbus consists of 2 units, comp and eq, I again disconnected the other first and then the other. Eventually I was actually, this time, able to replacate the similar click with both units on their own. It took some playing as it only comes maximum 1-2 times per song. So on the 3rd listening of the complete song the eq also produced it. So I figure it's not in the mixbus units after all.


- I have done every possible move regarding my apollo, hard drive, satellite, and what not, connecting in different ways with no result. I have used internal and external clocking (both master and slaving) with no difference. 

- I hook up my mixbus as follows. apollo twin out ch3-4 to my compressor, compressor hooks up to eq, eq comes back into apollo ch1-2 from where I print it. (this due to pro tools not accepting 3-4 to 1-2 as insert) So, could it be either apollo channels playing up or?
  

Sounds like it's not in your hardware chain - especially as it's doing it in bypass. Sometimes these gremlins are very tricky to track down, and you have to remove ALL variables to discern where it's happening.  My guess - conversion / clock or wiring or software related.

Try using NOTHING on your 2 buss insert - i.e. - remove the wiring from the back of your unit(s) and plug L/R input into output - essentially making the chain loop, but without the outboard in it. Record just as if you had hardware in the loop - but you only have DA>Wiring>AD.  Check for intermittent clicks over time. My guess is that you will still hear them.  Essentially nixing all outboard from being the problem.  Just a guess....but that's where I would start.

Any possibility it’s something in the Apollo clicking?

Most likely yes. That was my initial thought, but when I took it all apart and could not nail it, I suddenly got click-less a few times when I removed the compressor and kinda thought it must be it. But then when i kept beating my head against the wall and repeated the variations to a point of madness, I came to the conclusion that, it wasn't the hardware, has to be the Apollo. I have now simplified the routing internally in the console, and it kind of (not to jinx it) seem to work better. Have to yet give it some time to see how it evolves...

Ive been trying to monitor that, but I have so far only been able to catch them during playback. I tried connecting satellite and apollo separately to the mac instead of daisy chaining them, no difference. They're so sparse as they come 1-2 times over a song, sometimes not at all, so every time I make a change it takes some time to see how it goes, usually though, it clicks fairly early on. The clicks can vary also a little in loudness and character. That's why I think it might be in the outgoing signal as it was more prominent when compressor attach than when the eq was alone or the cables just looped. When I'm all in the box without routing to mixbus all is hunky dory. So it is in that loop something shits on itself.

Buffer too low?

Conquer, but I concur with your approach!

Was just pooling your leg !

Glad you narrowed it down!

It sounds to me like the electronic relay's are switching causing it to click, is there anything trying to alter sample rate? A plugin or something? If not, you might best off getting it RMA'd or replaced. Have you opened a support case with UA yet?