ElectroComp EML 200

images via this auction

"EML, Electronic Music Labs, of Connecticut. This was produced in the early to mid 70's as a companion expander piece to the famous EML 101. They were made to complement each other, for instance adding the master oscillator as a modulation source, or using the wave-shaper and ring mod to enhance the sound of another synth. BUT - this versatile Blue Box can also be used as it's own stand alone synth. Using an external sequencer or keyboard, you have 2 VCO's to control. The outputs and inputs on this are all 1/4" and are well thought out. For example: Most are duplicated, for more than one input or output option per parameter, and they're numbered for use in patching aplications.

Here are the modules:
• 1 master OSC, with sine, triangle and square wave outputs (2 each)—Freq. range from .01 Hz to 20k Hz—all can go simultaneously.
• 2 VCOs, with Center Freq. and swing. These can Freq. Mod.
• Spring Reverb with gain
• Analog A/B switch with independant gain—with pulse input.
• HP and LP filters
• Wave Shaper (ADSR)/Modulation section and Ring Mod + Sampler section (for S&H effects)
• Noise outputs
• 6-Channel Mixer with individual Levels and Pans
• Another Ring Mod!
• Pre-amp input with Low, Med and High sensitivity.

Sequential Circuits Pro One

More pics here via this auction.

Details:
"From the manual:
About the Pro-One
The Pro-One is a monophonic (one-voice) keyboard synthesizer. Its principal sound sources are two voltage-controlled oscillators (VCOs), referred to as OSC A and OSC B. OSC A, OSC B, and a white noise source can be mixed into the resonant low-pass filter (VCF). The filter modifies the voice timbre under control of its four-stage envelope generator. The filter may also serve as a sound source. This stage is followed by a voltage-controlled amplifier (VCA), which shapes the voice amplitude also under control of a four-stage envelope generator. The keyboard provides frequency control voltage (KYBD CV) for the oscillators and filter, and generates a GATE which controls the envelope generators.

In addition to this basic voice, the Pro-One has extensive modulation provisions. Three modulation sources are available: the filter envelope generator (FILT ENV), OSC B, and a separate low-frequency oscillator (LFO). Each can be mixed and routed for either DIRECT or WHEEL-controlled modulation of five destinations: OSC A frequency (FREQ), OSC A pulse- width (PW), OSC B FREQ, OSC B PW, and filter frequency (FILTER).

This complement of analog synthesizer modules and the routings provided for their interconnection have been well-proven in the Pro-One's ancestors, the Prophet-5 and Prophet-10 polyphonic synthesizers. Besides allowing the synthesist to play up to five or ten notes at one time, these two instruments contain microcomputers which program all the control settings comprising a sound. The Pro-One is neither preset nor programmable: you always "patch" the precise sound you want with the knobs and switches on the control panel. But the Pro-One voice itself is identical to a single Prophet voice, so it is capable of as much range and expression.

Possessing the Prophet's sound and all standard monophonic synthesizer features, the Pro- One's own microcomputer makes possible innovations unheard of on a lowcost synthesizer; a 40-note sequencer, an arpeggiator, keyboard modes such as single- or multiple- triggering, and the unique automatic glide feature. An audio input with preamplifier and automatic GATE generator allows synthesizer processing of low-level inputs such as a microphone or electric guitar. The audio output can drive a monophonic or stereo amplifier, or stereo headphones. Of special interest to computer enthusiasts, the Pro-One readily interfaces for control by an external microcomputer."

I love the introductions for synths in manuals. You get a glimpse of how the people behind the synth wanted users to perceive it - it's the culmination of all the work that went into the synth. Introductions to manuals were one of the first things I put up on the old Matrixsynth site back in Oct of '97. Click on the nostalgia link when you get there to see them.