I.S.C. Audio Condor GSM Guitar Synthesizer — Original Promotional Flyer (c. 1970–1971)

Original factory flyer boldly proclaiming “Guitarists arise!” and introducing the Condor GSM, an early and wildly ambitious guitar sound-modulation/synthesizer system capable of producing everything from harpsichord, organ, sitar, and sax tones to bass conversion, tremolo, vibrato, and repeat effects. Packed with dense feature descriptions and period enthusiasm, this piece perfectly captures the experimental spirit of early electronic guitar technology. Issued by I.S.C. Audio Corporation, it’s a scarce and highly displayable artifact from the dawn of guitar synthesis—ideal for collectors of vintage effects, oddball gear, and pre-pedalboard innovation.

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