HP-503: Transposing the HP-503 keyboard
Use the following procedure to transpose the HP-503 keyboard.
1. Press the Transpose button so it lights.
2. Press and hold the Transpose button, and then use the -/+ buttons to set the transposition amount.
Note: The transposition range is from six half-steps down to five half-steps up.
Note: You can enable and disable transposition by pressing the Transpose button so it's lit or not. The keyboard remembers your most recent transposition setting until you change it or turn of the HP-503.