Use the following procedure to split the keyboard on the HP-307:
1. Press the Twin Piano button twice. 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 the Twin Piano button and use the Tone buttons and + / - buttons to make your selection.
4. To exit Split Play, press the Twin Piano button.
1. Press the Twin Piano button twice. 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 the Twin Piano button and use the Tone buttons and + / - buttons to make your selection.
4. To exit Split Play, press the Twin Piano button.