Random other links that are useful:
Analog Synthesizer Resources (J. Donald Tillman, thanks)
Digisound 80 Modular Synthesizer
Leads Direct – DIN & MIDI wiring diagrams
Modular Synthesizer Comparison Chart
Moog™ Patents (J. Donald Tillman, thanks)
Moog™ Resources (J. Donald Tillman, thanks)
Moog™ Synthesizer Appreciation Page
Pace – Basic Soldering for Electronics (YouTube videos)
Panda Midi Solutions Great wireless MIDI system
Popular Electronics, February 1971 – Psych Tone
Pulsar Novation Excellent plug-ins and the “Pulsar 900 Series Modular Synthesizer”
Sourcing electronic components for SDIY (A. Majorel, thanks)