Noise issues w/ modular & mixer

Hay Everyone,
when I patch my modular audio signal into my Tascam M-06 mixer (with an adaptercable 3.5mm to 6.3mm) a noise appears (like white noise but more tonal), which can really mess with my recordings… with other stuff im running into my mixer this doesn’t happen (e.g. Analog Rytm).
Also i figured, that when i go from the modular into my audio interface directly, i do not have this issue (using the same cables)… also tried multiple adaptercable but same issue appears… any ideas how i could fix this?
Thanks a lot :slight_smile:

Is it possibly USB ground noise? Kind’ve squealy? Any USB cables plugged into any of that gear?