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 I 
don't have a GT-3, but I do have a GT-6 and it has an output control on the back 
side. I would assert to this if it were a GT-6 and I will suppose that it is 
entirely possible with the GT-3. I accidentally did this by a combination as 
follows I was using an electric violin with a passive piezo system and switched 
to an electric guitar with higher output pickups. I had also switched amplifiers 
and blindly plugged the setup together and proceeded to test this setup. The amp 
was setup with the master and gain up and with the GT-6 patch I chose I almost 
blew the speaker out of coarse I didn't continue to use these settings, because 
I have some respect for the cost of my equiptment. I would also suspect that 
this fellow might be covering up for his sons tendency to abuse equiptment with 
his explanation. I would say that there are actually no hidden features in 
either the GT3 or the GT6 just people who don't pay attention to what they are 
doing or don't care  ;-) 
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