It changes the turns ratio of the virtual output transformer.
I recently started fiddling with this parameter. I love what it does to high gain sounds. As Cliff said in moderation.
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Look up what a transformer is made of and its function in a amp.
If you have an Axe you have to be an engineer :mrgreen
So i guess what you and the other smart asses are saying is that you dont have a clue either...
seriously what crawled up yer A, tough guy? chill, no I have no clue but I have ears and can turn a virtual knob.