It's just a guess, but I think it's entirely possible that either the VDI circuit (when using the RJ45 connection) or the analog circuit is on but should never be both. The VDI gets it's power from the Helix, Variax power supply, or battery, but was never intended to be able to power both digital and analog systems onboard the axe at the same time. They probably designed the current draw for the necessary converters and output amps for the analog out to be shut off when there is no phone plug in the jack, which saves power. There isn't an endless supply of power available, even when plugged in. I also want to do this, but after reading what seems to be a big issue with it, have decided not to go there.