wudders Posted October 31, 2025 Share Posted October 31, 2025 I recently acquired a Mark V and it is awesome. I am using it with my Helix Effects unit, using the external amp switching feature . I am using a 4 cable method to separate effects between the front and FX loop. It works really well and allows for great control from the Helix for song-based patches. However, it does cause a really loud hum which is really noticeable on channel 3. Has anyone else encountered this issue or have any ideas what might be causing it? If I remove the cables from the channel 2 and 3 ports on the back of the amp and just use the boogie switch then the humming stops (the Helix is still plugged in for effects). I think Ive tried all possible switches on both the Mark v and the Helix but can't seem to eliminate it (even a noise gate after the effects loop doesn't completely remove it and of course that clamps down on my tone) Thanks in advance! Quote Link to comment Share on other sites More sharing options...
Schmalle Posted October 31, 2025 Share Posted October 31, 2025 Quote Link to comment Share on other sites More sharing options...
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