Use the following procedure to split the keyboard on the HP-507:
1. While holding the Transpose button, press the Twin Piano button. The Split Play menu will appear.
2. To change the right hand tone, press a Tone button and use the + / - buttons to make your selection.
3. To change the left hand tone, hold down the Transpose button and the Twin Piano button. While holding down these buttons, use the Tone buttons and + / - buttons to make your selection.
4. To exit Split Play, hold down the Transpose button and press the Twin Piano button.
1. While holding the Transpose button, press the Twin Piano button. The Split Play menu will appear.
2. To change the right hand tone, press a Tone button and use the + / - buttons to make your selection.
3. To change the left hand tone, hold down the Transpose button and the Twin Piano button. While holding down these buttons, use the Tone buttons and + / - buttons to make your selection.
4. To exit Split Play, hold down the Transpose button and press the Twin Piano button.