I have a JTV 69S and just got a Helix. I used to have a Variax 600 and POD XT and I could use the VDI for variax control and to output the sound. Now I have found that I can use the special workbench cable with Workbench HD only if I plug in the 1/4 inch jack too, but while both lights turn green I can't connect to the Variax from Workbench HD. If I plug into the Helix I have to plug in the VDI cable and the 1/4 inch to both the Variax and the Helix to be able to select the Variax as the input. I can take out the battery and it powers the Variax. Workbench HD can see and connect to the Variax through the Helix.
I thought maybe if I flashed it from 2,21 to 2.23 it might work but the closest I can get is with the Helix and it throws an error. I'm wondering if I have a wiring problem but that doesn't seem to make sense. something is wrong though.