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February 13, 2015 at 11:23 pm #127538
I'm not 100% sure what you're asking. There is a pedal function called "Toggle Tuner" which you can find in H9 Control under Pedal Settings / Aux Switch Mappings, which toggles the tuner on and off again. You can assign it to a single button Aux switch. Pressing the aux switch once will turn the tuner on, and pressing it again will turn the tuner off.