Sequential Circuits Inc. Poly-Sequencer advertisement (including the Prophet-5) from Keyboard Magazine. The ad on the left is from page 89 of the November 1981 issue, and the one on the right is from page 7 of the July 1982 issue. Versions of this advertisement ran in Keyboard Magazine for about a year and a half. The first version started showing up in late 1981, and was replaced by the second version in mid-1982 when the sequencer was upgraded with more memory. That ad continued to run…
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