Is it wavering? I mean do you get a sort of change occasionally? The UC definitely does have meters for volumes. No eq but you always gotta check the L R stereo mono. I am also getting a rare dip in volume on a particular track which I used over the ADAT. This must be because of the lightpipe I figure. It's usually pretty solid, but what I did was run the UC out from 2 in + 7 8 in, and mixed the channels 2 more to the Right. So this gets an occasional dip in audio very briefly, not exactly ideal. My preamps seem to be fine. Maybe you have a old unit with the need to clean those preamp pots. This has been known to happen on amps. I have currently another device, an AKAI Advance PRO, that is a midi controller, and just out of seemingly nowhere over the last half year or so, it seems that all its MIDI CC dials have gotten wavery and they will change settings on any plugin or synth that they are connected to completely uncontrollably. the unclean dial pots. Just got to get in and clean out the dust and grime. It could require taking off the front, best left to a pro since I have never cleaned these before.

I appreciate the reply!

So its a newer unit, maybe just over a year old with extremely light use. Just sitting in my desk rack, smoke free, set and forget just for my main PC. Rarely even plug things in.

Its a constant thing it seems. I ran a sine to left, right and stereo and Ch 1 is -6 Ch 2 is -2ish and seems to be similar on other inputs. I'll make a video and upload if I can.

I was thinking maybe its doing something weird with mic or line level but that seems like it would be much more of a jump in gain. 7&8 are even worse. This is so frustrating,

Not including the issues with the inputs, my main outs sound different and its driving me insane to the point where I'm probably gonna go to the doctor to test my hearing to just rule that out but I did a test to even bypass that.

I put my phone on my desk and set it to record a voice note, I played the same mono kick drum just an 808 on left ch and right ch and you can clearly see a difference in the waveform alone. Been an engineer for 10 years almost and this is really throwing me for a loop.

I also bypassed inputs and just tested audio coming out of my computer on anything, YouTube, windows media player, whatever, and audio translates fine looking at the meters on the outputs but still hear a difference in the outputs.

Well, you did say you thought the UC didn't have 'eq' but that is not exactly what you're describing, which is a volume difference. The UC does have a panel for controlling the volumes have you used it and hit the reset button? it resets the whole interface. Can create a large amount of work if you have it all set up as I do to run that ADAT out of one into another interface via optical. But it might change your interface back to zero. Try it. just click on the interface in the UC, then the interface's mixer panel comes up. Just click reset it's in the top right area of the UC display when the mixer showing below. The interface carries the settings with it, so if someone ever had it set up it could still have the settings from before.

ADAT would be cool but I have nothing that supports it and dont really wanna go through that and tbh I shouldn't have to.

Also I am having both volume issue on the inputs but my output Im missing some low frequency. Maybe my unit got fried on a power outage? I had it on a UPS but idk.

I also factory reset everything and bypassed the mixer in UC.

I made a support ticket but the website is literally so useless it wont load the response they wrote and refuse to get on the phone so we'll have to drag this 10 minute phone convo out over like 3 months of support ticket emails probably lol.