Resource Library

Service Manuals and Schematics

PSS-460 Service Manual
DigiTech DSP 128 Plus Schematics
Mattel Synsonics Service Manual
Realistic Reverb Schematic (Updated to fix IC 1-B ambiguity)
Yamaha VSS30 User Manual
Portasound PSS125 Service Manual
YM3812 Datasheet
Moog Prodigy Schematics

UMR2 Documentation

UMR2_Ultimate Manual
Highly Liquid UMR2 Keyboard Matrix Explained
UMR2-User-Manual-RevC-V1.0
Highly Liquid UMR2 MIDI Retrofit – Yamaha PSS-470
Highly Liquid UMR2 MIDI Retrofit – Casio SK-1
Highly Liquid UMR2 MIDI Retrofit – Teisco SX400