I noticed recently that my vx-351 is inducing some strange noice when it's connected to my voyager OS. It's not 50 Hz ground hum, more like a bunch of different signals with varying cycles.
It was more apparent when I used my Roland jc-120 (solid state amp), compared to my practice ampeg gvt15 (tube amp).
Is there someone else who can hear noice/hum from their vx-351 when used with different gear?