I am running a PedalSnake between the MFC-101 and the XL+. The PedalSnake is MIDI but I use connectors that convert it to XLR and use Faslink. Sounds great. I decided to try running an XLR cable using Faslink rather than the PedalSnake because the Pedalsnake is more bulky with four cables within it. It works but tone is markedly different. It is as if the guitar tone control turned down the highs. What gives? Doesn't the MFC just change from one preset to another? Why should it influence the tone? I tried two different XLR cables, both nice Mogami ones. I also tried using an ethernet cable and got a Time-Out. I would like to switch to the XLR cable but not with this much difference in the sound. Also, when I use the expression pedal to turn down the sound to zero, it won't turn it back up. I have to turn the XL+ off and back on? It was working OK before.