I have just received my helix LT in the mail today from reverb.com and attempted to plug it into my 6505 through the 4 cable method the same as ive been running on my pod hdpro and was met with the loudest feedback my amp has ever created. Upon further inspection ive found the volume knob on the HLT is not controlling the volume at all, and that the front face of my 6505 is still controlling the sound. But even the control it has over the sound is limited, and not working as it would normally. The patches aren't coming through sounding as they should either. I have tried changing the ins and outs of my helix and even changing the settings for the volume knob in the global controls and I have had no luck. I have even tried switching around my cables and even ruining guitar in and 1/4 out to my amp and still can't get the volume to work, or for it to sound like the patches rather than just the flat amp sound