2015, no response from Line6 supporters, shame.
I have the same problem with my DL4 now, left output noisy, right output it's ok. It's a second hand pedal, 6 years with me. I don't know how much time with the previous owner. But for some reason last month i notice this hum noise only through left output. It's annoying because i use two amps for stereo delays.
After some troubleshooting (factory reset, clean contacts, etc) i didn't solve my problem. I think the only solution here is to change the left 6-pin output jack from the DL4. I think it's faulty (years of use) and are not doing the ground properly.
Any help or solution?
Thank you,