"Heterodyning is the generation of new frequencies by mixing, or multiplying, two oscillating waveforms."Pictured here:
"Passive Heterodyners
Each cassette contains a high pitch oscillation. When both cassettes are played through the heterodyner a series of new frequencies are formed. Any tapes can be used as well. Edition of 10."
You can find samples and some for sale at AA Records via jonah
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