TC Helicon Voicetone C1 Popping!


Hey all! 

I have a new Voicetone C1, to use live and imprint on studio vocals while recording. I currently have it running from the mic to a UA Apollo Twin Interface, into the computer. I've moved cables around, updated to latest firmware and have tried two different mics, Shure SM7B and Neumann TLM 103. No matter what I do when I'm using the voice tuning, it constantly pops throughout the audio.

Any fixes?