Is anyone doing this? I started doing this over a year ago with my mustang 3 v2. At first I ran a regular guitar cable from the mustangs fx loop send into my other amp,it sounds good that way but it doesn't showcase the stereo effects like I wanted. So I went to guitar center and bought an xlr to 1/4" jack and now run out of the right line out of the mustang into the input of my Ampeg Reverborocket and it sound huge. With the effects like pitch shift, delay and reverb I can get some really cool spacial effects and other usable tones.