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The Rev 2 has SSM filters.
"This listing is for a Vintage SEQUENTIAL CIRCUITS Prophet 5 Rev 2 Analog Synthesizer Keyboard. Serial #1000 - 0244
Rev 2 w/ Cassette Mod (See HERE for explanation)
Uses the better sounding SSM Chips"
"In 1980 the Prophet 5 Rev 3.0 came out. The Rev 3.0 had a cassette interface on board. The Rev 2 did not have this feature. Therefore Sequential thought it was interesting to bring out a cassette interface mod for the Rev 2. And so they did. The cassette interface modification for the Rev 2 existed only as a retrofit and was never a standard feature on a Rev 2. An official revision 2.1 (or even a 2.2) never existed in contradiction to what some sources may say.
Two small grey buttons are visible on the Rev 2 models (panel far left and top centre). These were 'Preset' controls to enable instant editing of mod and filter sections for the selected patch; they also doubled as cassette interface load and save controls. They are left out from on a Rev 3."
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