Roland PG-Series Programmers are dedicated devices designed to control and edit the sound parameters of compatible products. They can be used for easy design of new sounds and patches. The PG-Series Programmers front panels offers an extended palette of faders and knobs. These manipulate the sound parameters by sending SYSEX messages in real time through the MIDI OUT jack of the Programmer to the MIDI IN jack (or to a dedicated input) of the keyboard or sound module. Here is a list of PG-Series Programmers and their compatible units: The PG-10 Programmer is designed for use with D-5, D-10, D-20, D-110 and GR-50.