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"Up for sale is a (1) very rare vintage Polyfusion Frequency Follower, model FF-1. It's in perfect working condition. It's a pitch to voltage converter, especially made for using with Moog or Polyfusion modular synthesizers. The bottom and top plates are not original, custom made and there are some scratches on it (see photo's). It is a 110V version, we deliver it with a converter to 220V."
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