PE Clef String Ensemble Kit-Made Analog Synth from 1978 - designed by A.J.Boothman and published in Practical Electronics magazine.

*with VKS Mods: easily accessible ‘breakout’ potentiometers from the Chorus - fast and slow modulators (VR9 and VR10 on schematic - replaced with two B47K pots ) and Resonant Frequency controls for the Brass and Woodwind (VR16 and VR17 - replaced with two B47K pots ) with a chorus defeat switch (between Pin 2 of VR11 and Ground.)

Scans of original magazine documentation with full schematics and instructions:

PE Clef String Ensemble Part 1

PE Clef String Ensemble Part 2

PE Clef String Ensemble Part 3

PE Clef String Ensemble Part 4

PE Clef String Ensemble Part 5