CONTROLS & CONNECTIO NS

Soft

The Soft button selects Soft Knee and Hard Knee compression curves. When this button is pushed in, Soft knee compression curves are used, otherwise hard knee compression curves are used. With Hard knee compression, the gain reduction applied to the signal occurs as soon as the signal exceeds the level set by the threshold. With Soft knee compression, the onset of gain reduction occurs gradually after the signal has exceeded the Threshold, producing a more musical response (to some folks).

Auto

When pushed in, the Auto button places the compressor in automatic attack and release mode. The Attack and Release knobs become inoperative and a pre-programmed Attack and Release curve is used.

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Presonus Audio electronic ACP88 user manual Soft, Auto