Use the following procedure to layer two Tones on the HP-507 (Dual Play):
1. While holding down the Grand Piano button, press the Strings button so that both of them are lit.
2. To select a different tone for the Grand Piano, press the + / - buttons.
3. To select a different tone for the Strings, hold down the Strings button and press the + / - buttons.
NOTE: If you hold down the Strings button but do not make a new selection, you will automatically exit the layer mode.
4. To exit the Dual Play layer mode, press any of the tone buttons.
1. While holding down the Grand Piano button, press the Strings button so that both of them are lit.
2. To select a different tone for the Grand Piano, press the + / - buttons.
3. To select a different tone for the Strings, hold down the Strings button and press the + / - buttons.
NOTE: If you hold down the Strings button but do not make a new selection, you will automatically exit the layer mode.
4. To exit the Dual Play layer mode, press any of the tone buttons.