When connecting a 3.5 mm cable to the mic/line in there is a hiss you can stop it by pressing your finger to the tip.
DEFINITELY NOT A GROUND LOOP USB ISSUE
If you put a cable in the input and press the red mic button there is noise and if you sample/ record you can still hear it
Has anyone found a way to stop this?
I just want to sample via line in without the sound being colored by digital noise