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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