GNR1010

I want to tune my guitar down half a step using the Korg Tuner.
It has a flat button, Do I hit the flat button once for it to go down half a step? And when I want to go back to standard tuning just turn the device off and on again?
Sorry im a noob with these tuning devices.

Zaphod_Beeblebr

That's how most guitar tuners work, I don't use those ones much any more though; I own three tuners and they're all chromatic ones. I think once you're past that very initial stage of fretboard learning the chromatic ones are better.

Also: don't say "the korg tuner", they make tonnes of the things; I very much doubt the one you have is the same as the one I use even though they're both korg.

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socrfb

I have a Korg GA-1 (if that's what you're using, I recommend replacing it like I did) and yes, for every half-step down you want to tune you hit the flat button once.