PRESONUS AudioBox Stereo Quick Start Manual page 320

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Output Level. Displays output level + RMS.
• Input Gain. Attenuates or amplifies the compressor input. Variable from -12
dB to 24 dB.
Auto-Gain. Engage to automatically fix the 0 dB input level to the 0 dB
output level (guarantees a 0 dB input level will result in a 0 dB output
level). When Auto is not engaged, Gain (output gain) is variable from 0 dB
to 48 dB.
• Attack. Adjusts attack time for dynamics processing. Variable from 0.1 ms to
400 ms.
• Release. Adjusts release time for dynamics processing. Variable from 1 ms to
2s.
• Speed.
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Auto. Engage Auto to automatically set varying attack and release settings
based on signal content.
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Adaptive. Engage to automatically vary attack and release times in order
to avoid pumping. This will result in less-aggressive but smoother
compression.
• Sidechain. Engage by clicking Sidechain button at the top of the effect
window to allow other sources to control the Compressor or use the internal
filter sidechain.
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Sidechain Channel Display. Displays the current sidechain channel
source.
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Ratio. Click the top right handle to adjust when Auto-Gain is not
engaged.
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Threshold. Click the middle handle to adjust when Auto-Gain is
not engaged.
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Knee. Use the mouse wheel while floating the cursor over the
middle handle to adjust when Auto-Gain is not engaged. If you
don't have a mouse wheel, type in a value or use the Knee knob.
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Gain. Click the bottom left handle to adjust when Auto-Gain is not
engaged.
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Auto-Gain Engaged. Click on the middle handle to adjust all
parameters.