"A lot of the synthetic-sounding things you hear are actually recordings of us playing other instruments – pianos, flutes or twanging guitar strings – or field sounds we get from walking around with portable tape recorders, like electronic beeps in shops, or vehicles; then they are mangled beyond recognition. We have an arsenal of old hi-fi tricks up our sleeves and we basically destroy the sounds until they're really lovely and fucked up. So we're using sounds that are totally our own thing."
January 1, 1970
https://en.wikiquote.org/wiki/Boards_of_Canada