API Audio The Channel Strip - Manual (Page 14)

4.2 Compressor Controls
The 527 Compressor provides a comprehensive suite of controls:
• THRESHOLD: The level at which compression begins
• ATTACK: The time it takes for the compressor to respond
• RELEASE: The time it takes the compressor to return to unity gain
• RATIO: The amount of compression applied after threshold
• TYPE: NEW or OLD detection path topology
• KNEE: The characteristic of the response curve at the onset of compression.
• THRUST®: Patented circuit that inserts a high-pass filter before the RMS detector
• GR Meter (GAIN REDUCTION): 10 LED gain reduction meter
• LINK: Activates the DC LINK for stereo/multichannel processing with other TCS units
• COMP BYPASS (Compressor Bypass): Completely removes the 527 Compressor from
• POST EQ: Moves the 527 Compressor to post the 550A Equalizer in the audio path
4.2.1 Threshold
THRESHOLD: Sets the level at which compression begins
• Continuously variable between +10dBu and -20dBu
• Detented rotary pot for easy recall
4.2.2 Attack and Release
Attack and Release times are fully variable on the 527 Compressor and share a
dual-concentric potentiometer for control. Attack time is adjusted using the
outer ring of the pot and Release time is adjusted using the inner knob.
ATTACK: Sets the time it takes the compressor to react when the level exceeds
the set THRESHOLD
• Continuously variable between 1 and 25 ms (milliseconds)
• Detented rotary pot for easy recall
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