Electric/acoustic guitar built-in pre-amp settings. What do it do?

SKR

New member
One the left side there's the Volume and Tuner.

On the right side is: LOW MID HIGH, each can go from -12 to +12
What is that? Is that the Treble/Bass?

And below that is AMF, which ranges from 80 to 10k
Clueless about that too.

Please help.

PS. It's Yamaha APX700 which uses the A.R.T pickup system.
 
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