HP-307: Splitting the HP-307 Using Split Play
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.