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The filter EG modifies the voice [[timbre]] and may also serve as a sound source. The VCA EG shapes the voice [[amplitude]]. The voices are summed together with a single white noise source. With a keystroke a voice is gated to trigger its two EGs.<ref name="techman"/><ref name="mbll"/>
The Prophet-5 was the first synthesizer to feature five fully polyphonic voices and to be able to store and recall every patch parameter for up to 40 memories, (later expanded to 120).<ref name="mag"/><ref name="reid">''[https://web.archive.org/web/20150510024530/http://www.soundonsound.com/sos/mar99/articles/retroprophet.htm Sequential Circuits – Prophet Synthesizers 5 & 10 (Retro)]'' by Gordon Reid, Sound On Sound, March 1999</ref><ref name="dub">[http://blog.dubspot.com/prophet-5-spotlight/ Classic Gear Spotlight: Sequential Circuits Prophet-5 Synthesizer] by Ross Kelly, Dubspot, 8 Nov 2016</ref>
== Revisions ==
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There were three ''revisions'' of the Prophet-5 between 1978 and 1984:
*Revision 1, , instrument code 1000.1, serial numbers 1-182. The least common. Uses [[Solid State Micro Technology For Music|SSM]] ICs. These were very unreliable. Cannot be retrofitted for [[MIDI]].<ref name="techman"/><ref name="mbll"/><ref name="forrest">''The A-Z of Analogue Synthesisers Part Two'' by Peter Forrest, Short Run Press Ltd, 1996. p. 114.</ref><ref name="reid"
*Revision 2, instrument code 1000.2, serial numbers 184 to 1299. Uses SSM ICs. Is usually considered to be the better-sounding version of the Prophet-5.<ref name="ko"/><ref name="techman"/><ref name="mbll"/><ref name="forrest"/><ref name="vse"/><ref name="reid"/>
*Revision 3, instrument code 1000.3.0 to 1000.3.3, serial numbers from 1300. The most common. Uses [[Curtis Electromusic Specialties|Curtis]] ICs for increased stability and reliability. Is considered by some to have a thinner sound than the previous revisions. These start at serial number 1300.<ref name="vail"/><ref name="ko"/><ref name="techman"/><ref name="mbll"/><ref name="forrest"/><ref name="vse"/>
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