even with my modular turned off, if connect one of the CV out's from the quenexus to any of the CV in's on my modular - a faint, very high pitched tone comes through my monitors. no daw open, no gain on interface's input, no output volume on interface's outputs. still present when everything is powered on and running - but does not produce this sound if the qunexus is powered off (and connected via CV), or only connected by usb (no CV at all).
using official CV cable kit, double checked all cables to and from modular, interface and monitors. using a pittsburgh modular cell48 system 1 - brand new. also moved the quenexus to different usb ports, and directly to computer.
would love some advice, thanks in advance.