Hey everyone. I'm hoping you will be able to help me, as this is about as good as it gets for all things Helix. Use case: I want to be able to track a DI guitar track AND track my amp simultaneously. The gear in question: 2010 iMac running Logic X Helix Floor Fryette Power Station PS-2 (running as a silent reactive load, not connected to a speaker) VHT Pittbull CLX Head Kit-build Les Paul clone with Graph Tech Ghost piezo system, Duncan JB in bridge, P-Rail in neck. Hardware Signal routing: Guitar-->Helix Guitar In Send 1 (Instrument Level)-->Pittbull Hi Input Pittbull Speaker Out-->PS-2 Amp In PS-2 Line Out-->Helix Return 4 (Line Level) Internal routing within Helix: Path 1: Input: Guitar --> Output: Send 1 Path 2: Input (Return 4) --> Helix Cab emulation --> Output (USB 3/4 panned hard left) The problem: Lots of noise. I haven't been able to diagnose the frequency, but it's a higher pitched whirring type of noise. Diagnostic Steps Taken: I've swapped all of the cables and toggled the ground lift switches on the Helix, Pittbull, and PS-2. None of these trials made any impact. I do NOT experience the issue if I plug straight into the Pittbull, which then, via the PS-2 is feeding Return 4 in signal path 2 on the Helix. Then it sounds great, but precludes me from being able to do a DI take with the amp affected take. Preliminary Conclusion: I believe I have narrowed the issue down to something related to the Helix's Send 1. I appreciate any help/pointers that you can provide.