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Maxon AF9 Auto Filter
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      Maxon AF9 Auto Filter (105295109)
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Originally introduced as a key component of analog synthesizers, envelope controlled filters came into prominence in the early 1970s with the release of the legendary Mutron III. Envelope filters are wah-wah type sliding filters that are triggered by an input voltage. Unlike standard wah pedals whose center frequency is controlled by moving a treadle, an envelope filter's center frequency is controlled by playing dynamics, allowing for an almost unlimited variety of effects based on expressive nuances in a player's performance. The AF-9 Auto Filter represents the state-of-the art in analog filtering. Like the original Mutron III, the AF-9 uses a CdS Photocoupler HTV P873 rather than a VCA at the heart of its circuit. The unique sound of Photocoupler circuitry provides a liquid, shimmering, vowel-like filtering that cannot be produced with other components, giving the AF-9 superior sound quality with lower noise levels than the competition. The AF-9's Threshold control determines when the effect will trigger, while the Peak control boosts the center frequency for more dramatic filtering like a Resonance control on a synthesizer. Selectable Range control HiLow determines the overall tone of the AF-9, while the Drive UpDown control determines the direction of the filter sweep. Three selectable Filter types Hi Pass, Band Pass, and Low Pass and a frequency range of 100 Hz Ð 4 KHz allow the AF-9 to function with virtually any instrument or input signal. From simple wah-wah's to outer-space noises, the AF-9 provides the most desirable swept filter effects in a compact, user-friendly package.

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