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EVOC 20 PS envelope in Logic Pro for iPad
The EVOC 20 PS Synthesizer section includes an Attack/Release envelope generator that controls the levels of the oscillators over time.

Amp Envelope parameters
ENV Attack slider: Set the time it takes for the oscillators to reach their maximum level.
ENV Release slider: Set the time required for the oscillators to reach their minimum level, after the keys have been released.
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