Check the listing for details. API 527A 500 Series Compressor/Limiter. Condition: New. Listed at 1195.00 USD. Classic API Compression for Your 500 Series Rack The API 527A will infuse your projects with the same unmistakable sound that launched a thousand hit records. The 527A takes API's popular 500 Series compressor/limiter module and elevates it with an overhauled 10-segment gain reduction meter and a bypass switch with a soft bypass option for adding color to a signal without compression. This module teems with signature API sound, courtesy of 2510 and 2520 discrete op-amps, and it includes 31-position detented controls for easy repeatability. The 527A offers both feed-forward and feedback compression, hard- and soft-knee compression, and API's patented Thrust function for frequency-dependent sidechain control. You can also link two 527A modules together for effortless stereo operation.