HP-203: Transposing the Keyboard
Use the following procedure to Transpose the HP-203:
1. While holding the TRANSPOSE button, use the + or - buttons to raise or lower the transpose amount in half-step increments.
2. Release the TRANSPOSE button and begin playing in the new transposition.
3. To return the transpose value back to ZERO, hold the TRANSPOSE button and press both + and - simultaneously.
4. Release the TRANSPOSE button and the transpose function will be returned to normal.