via this auction
"Proteus I uses the famous Curtis Electro-music integrated circuit ship set
-Envelope times from 1 ms to 30 second.
-LFO rates from 15 cycles per second to one cycle every 15 seconds.
-Oscillators and filter range of over 12 octaves Control normalization gives you an almost unlimited spectrum of tone colors and timbres including hard sync’d voices
-Up to 16 presets may be saved at once
-Extensive rear panel patch bay
-Provision for FM synthesis
-Easy to use
-A single button stores your sound for as long as you need it; even over a year without power.
-A computer port provides a standard means of interconnection for digital control of both keyboard and front panel and allows composition length sequences, score editing, mass present storage and sync-to-tape
-37 keys"
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