Michael Karoli said to this: "We never used synths until the very last records. '_Vernal_ _Equinox_' uses a ring modulator applied to Irmin's piano and organ; a synthesiser allows you to get a very large number of sounds from which you can choose, but Irmin's idea and everyone else's was to take an instrument with a certain sound and to change that sound into something else. That's more creative, again because of limitations; using a synth is too easy, you just turn a switch and you get a completely different sound. The Alpha 77 unit we used wasn't a synthesiser, it was a sound modification unit built to Irmin's specification. We used its ring modulators on the _guitar_ and bass, and it also produced flanging which was really a fault in the machine; it used a tape under tension for echoes and it tended to slip a little. Many of the effects in Can music came about that way, which is still for me more interesting and more creative than intentional things." Check for more: www.muzines.co.uk/articles/michael-karoli-on-guitar-improvisation/5919

this is a great version too

WHOOPS didn`t want to post this HERE HAHAHA