I'm using the following setup: Guitar to helix, 4 cable method to Carvin Legacy VL300 amp, amp to Carvin Legacy 412 cab, and xlr outputs to mixer then stereo cabs.
I'm also feeding a stereo loop pedal via sends 3 and 4.
Guitar -> Helix guitar in -> Helix Send 1 -> Amp In -> Amp Send -> Helix Return 1 -> Helix Send 2 -> Amp Return (i use the send 2 instead of the 1/4" out because this way the volume is not affected by the helix volume knob).
Helix Xlr Outs to mixer, and Sends 3 and 4 to Loop Pedal, then mixer.
You can see the scheme in the picture
Problem is, when i plug the guitar straight to the amp, there's no noise, no hum, everything clear on all chanels.
When i plug the guitar to helix straight to mixer, with amp simulations, no noise, no hum, everything clear.
When i use the 4CM, lots of noise.
You can hear it in the video. first guitar straight to amp. then plug the guitar to helix guitar in, and the remaining 3 cables. And you'll hear the diference...
-change all the cables, audio and power.
-plug the power to diferente places, then same place.
-change the outs from line to instrument, and vice-versa.
Nothing works. Any guesses??