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press any key on the musical keyboard and you should instantly hear a sound.
if it is silent, turn up the master volume located next to the speaker,
or press the synthesizer or drum key.
pro-tip: press and hold the help key while playing the musical keyboard to let your OP-1 display the current note.
use the arrow keys to transpose octave while in synthesizer or drum mode.
note: before you start creating your first masterpiece, read this manual carefully to avoid deleting or over-recording your work.