The DisCover 5's UPPER, LOWER and SPLIT buttons allow you to layer two sounds on top of each other, or to play each in its own area of the keyboard.
- Press the UPPER and LOWER buttons so they're lit.
- Locate the SPLIT button. If it's:
not lit: the upper and lower sounds are layered, and play together across the entire keyboard.
lit: the keyboard is split. The upper sound is played by your right hand, and the lower sound is played by your left hand. - To return to normal operation, press SPLIT so it's not lit, and turn off LOWER.
You can download the DisCover 5 Owner's Manual at https://www.roland.com/global/products/discover_5/support/