sorry no flanger here, I do have a TC Trinity reverb , TC Flashback delay and Digitech Luxe but didn't experience any volume boost. But even though it's only 7w / 15w it was too loud when trying to practice at low volume and the volume knobs don't taper down to well (when you are at 1 you can't taper down to 1/2..it's either 1 or 0). So I hooked up a volume pedal in the loop and solved that problem. Now I can set the volume on the MT-15 to 1,2,3 etc and just come down on the volume using the pedal. So you might need a volume pedal to fine tune that overall volume you are getting.