Ok I'm not imagining things. Somethings definitely broken.
Here's a video of monitoring 1khz sinewave directly from RCA output to my M-Audio Transit soundcard. Sorry about the quality, the Audacity scale you see is -60dBFS -> 0dBFS across the screen. You can see 6-10dB difference from right channel at bottom volumes.. and there's many fishy spots even at normal volumes where volume jumps very erratically.
https://vid.me/EQAJ
Well, that doesn´t look right at all...
I would contact kingwa, maybe attatch the video, and see what he says.
If you have to get it repaired and are outside fo the 1 year full warranty (no delivery costs) maybe consider contacting Magna-Hifi to safe a bit.
Hope all will work out for you, and keep us updated on the progress!
Edit sais:
The jumps you mentioned must be the occasional pops when the relais switch, this seems to be normal tho.
I noticed that most of the time they appear when you change from 10-11 , 20-21, and so on.
I guess the relais are seperated into groups of 10, and when switching between those groups you have those pops.
But they are only really there when there is a signal (like music playing).
When there is now or only a small signal they are not audible. The louder the signal, the louder the pop.