PreSonus ACP88 User Manual
Page 10
CONTROLS & CONNECTIONS
7
•
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.
• 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.