I have been trying to find a way to record an unprocessed signal and a processed signal from my Helix LT.
Originally I tried an ABY box with a. ground lift. The clean channel seemed normal but it created a hum in the processed channel along with the processed signal. If I unplugged the second cable from the ABY box there was no hum.
So then I tried skipping the ABY box and using a send as the first block in the chain. It seemed to record a perfectly clean tone in Logic Pro X. But when I tried putting any virtual amp on the unprocessed recorded track it had the same hum as the processed track running out from the Helix LT.
I could understand the ABY box having noise issues but I can’t for the life of me understand why the unprocessed send would have a hum.