FP-4: Layer Sounds
Use the following procedure to layer two instruments:
1. Press a TONE button and use the + / - buttons to select your first instrument.
2. While holding the same TONE button, press a second TONE button to select the layered instrument.
NOTE: You can change the layered instruments after you have created the layer. To change the first TONE, use the + / - buttons to select another instrument from that TONE group. To change the second TONE, hold the second TONE button down and then use the + / - buttons to select another instrument from the second TONE group.