Split.RBK is a registration file made with Chandler Holloway's RBK Mixer, which changes the volume for the U1, U2 and L layers of a CDP-S350 piano (may also work for the CDP-S360, as well as keyboards in the CT-X700 series). Patches and rest of settings at default, except that accompaniment volume is lowered to 80. This is what the different registrations do: 1: U1 and U2 at 100%, L at 75% 2. U1 and U2 at 100%, L at 50% 3. U1 and U2 at 75%, L at 100% 4. U1 and U2 at 50%, L at