Recently got one of these little boxes and set it up at my computer with headphones using Studio mode. When I plugged it into the front of my Super Reverb I changed it back to amp front connection mode and it sounded pretty trebly and tinny. Not like what it sounded through the headphones. If I plan to use it on a standard front connect amp should I have set it up with headphones using the front amp mode? I guess it would be easier to set it up using the amp itself I guess but a bit awkward to do all this using the computer.