midiplus AKM320 - 2.3 Octave; 2.4 Transpose

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2.3 Octave
The “Octave UP & DOWN” buttons can be used to enlarge the
32-key to 88-key or more. With it, you can play the note from –C1 to
C9(128 notes). Some players want to play start with C2 not C3, He
can change the Octave value to -1 easily.
2.4 Transpose
You can transpose the KEYBOARD, shifting it up or down in
semitone intervals.