Developed in association with Automated Processes Incorporated, the API Collection features four precision processors based on renowned API modules: the 550A 3-Band Equalizer, the 550B 4-Band Equalizer, the 560 Graphic Equalizer, and the 2500 Stereo Compressor.Used by engineers worldwide on countless hit records, these modules deliver a sound like no other. And with the API Collection, Waves captures every nuance of their unique sonic signatures.