oxyzzenic

I try on blank preset even the input is minimum, only connect on powercode and phone out. The noise happen same way.

I mean this knob I use AIAIAI headphone it has no volume control on itself Also noise came from only phone jack

In my case on Helix, If I turn the phone volume near 3oclock degree to maximum, I can listen the noise. I did it with no connection on any devices, jack, amp blabla anything. I turn off every fx inside the preset and make the input volume to 0db(It means I check it with no input). However without all my effort, I still can listen the noise. I check the headphones and connecting jacks but no problems are found. Is it only happen to me or happen to every helix devices?