API Audio The Channel Strip - Manual (Page 15)

RELEASE: Sets the time it takes the compressor to recover to unity gain after
the level falls below the set THRESHOLD
• Continuously variable between .3 and 3 seconds (S)
• Detented rotary pot for easy recall
4.2.3 Ratio
RATIO: Sets the ratio of input vs. output levels for signals that fall above the
set THRESHOLD
• Continuously variable between 1:1 and ∞:1
• A Ratio of 10:1 or greater is generally considered to be a limiter
• Detented rotary pot for easy recall
4.2.4 Compression Type
The 527 Compressor can be set to operate in two circuit topologies:
• OLD: Feed-Back topology: The RMS detector receives the signal from after the VCA
• NEW: Feed-Forward topology: The RMS detector receives the signal from before the VCA
The compressor circuit topology is selected using the TYPE switch.
TYPE: Selects the compressor circuit topology
• OLD: Feed-back topology (default setting with switch disengaged)
• NEW: Feed-forward topology (switch engaged)
• Illuminates when engaged
4.2.4.1 OLD: Feed-Back Compression
In a feed-back compressor, the RMS detector gets its signal from the output of the gain
reduction device (VCA). This is how older API 525, 1176 type, and 660 type compressors
work. This yields a smoother, softer, more transparent sound.
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