Use the following steps to transpose the BK-3 up or down in octave increments:
1. Press an OCTAVE button to display the OCTAVE menu.
2. Use the UP / DOWN cursor buttons to select "UPP" or "LWR."
NOTE: "UPP" will set the octave for the upper tone in DUAL or SPLIT mode. "LWR" will set the octave for the lower tone in DUAL or SPLIT mode.
3. Use the DEC / INC buttons to set the octave shift amount.
NOTE: The OCTAVE transpose range is from 4 octaves down to 4 octaves up.
NOTE: The OCTAVE menu will exit back to the previous menu after a few seconds.