I just purchased the HD500X, L2t and L2M. I used the non Line 6 aes/ebu cables to connect the HD500x to the L2t then to the L2M and it worked perfectly. However, I had downloaded some patches from "custom tones" and some of them do not allow me to control the volume. The volume pedal and the volume knob and master have no effect. I switched patches and nearly blew out my eardrums. Volumes in the back of the two stagesource speakers where pretty low. Any thoughts?