When a sound is first sampled, that sample is referred to as a Tone. In order to use a Tone, it must be assigned to a Patch. A Patch consists of one or more Tones, each mapped to a key or range of keys across the keyboard. In Edit Mode, the Patch PRM page contains parameters that determine how the Tone(s) will respond when played. The first parameter is the Key Mode. There are 5 Key Modes to select from. A full explanation of these Key Modes and the other parameters found on this page are in the S-50 manual on pages 39-42. The default Key Mode for a Patch is "Normal."