MOOG Sonic 6

Title link takes you to shots via this auction. Not the best, but you don't see these too often.

"I didn't realize when I got it that most of the first video game sounds were made with this synth, but you can definitely tell after playing around with it for a while. The thing I like most about this synth is the fact that you don't have to have it plugged into an amp to hear it. It has 3 built in speakers that can even take the fat low unmistakable Moog sounds.

The Moog Sonic Six is a 2-VCO duophonic synthesizer with a built-in speaker and a 4-octave, 49-note (C-C) keyboard. Each VCO can output sawtooth, triangle, and rectangle (pulse/square) waveforms as well as 2 "waveform generators." A "quality" knob adjusts the width of the rectangular waveform. White or pink noise is also available. The Sonic Six can be set for 3 keyboard modes; high note priority, low note priority, or duophonic. The Sonic Six can also be set to an alternate tuning across the keyboard (different interval between octaves of the keyboard). Portamento rate is controlled by a knob. The envelope section features a basic envelope, with variable control for attack and decay and a switchable release (follows decay) and sustain. It had a single VCF, low-pass voltage controlled filter. Two multimode LFOs are available. Their speed is independently variable and can be controlled by the envelope."