Found an intermittent possible bug in the PowerCab 212 when daisy chaining two together with a Helix. I was able to reproduce almost 100% for a bit while writing this up, but then sometimes I can’t.
Connect guitar to Helix
Connect Helix Line 6 Link out to PowerCab 1 Line 6 Link in using an AES/EBU cable
Connect Line 6 Link Out on PowerCab 1 to PowerCab 2 Line 6 Link in
Power Helix On, then PowerCab 1, then PowerCab 2.