how to use reference tone

how to hear reference tones?

press <reference tones> icon, press any key on the keyboard or up/down buttons.

frequency calibration? 440Hz ~ 445Hz

press "A4 440Hz", press any from "440Hz" to "445Hz."

how to change instruments?

press <instrument> icon, the instrument type and the icon rotates among piano, guitar, sine-wave.

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