I only need a MIDI out. No thru is needed. I build a MIDI Fader from PAiA Electronics around the 8051. THe WaferScale ST is the PDS900 which includes an LCD display. I have three MIDI units that I need to change to various patch numbers. Example. Unit 1 channel 1 to patch 27, then unit 2 channel 2 to patch 5, then unit 1 to patch 13, then unit 3 channel 3 to patch 47 etc.

Thank you for your response,

Bill