3. musical keyboard
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3.1 playing a sound
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.
help key
3.2 octave shift
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.