Apogee FX Rack Opto-3A

For over 3 decades Apogee Electronics has set the standard in professional digital audio recording. Now, Apogee FX Rack brings the same expertise and approach to the world of software audio plugins. Apogee FX Rack combines a premium selection of modern and vintage plugins with audio hardware DSP and simple yet flexible workflow options. This is the OPTO3 Vintage Compressor/Limiter, and optical Compressor/Limiter that reproduces the reactive compression characteristics of modeled hardware. It features extended HF emphasis functionality, sidechain HP filter and a dry/FX mix control. 

It runs natively in your favorite DAW on your Mac, with no Apogee hardware required, as well as on Apogee hardware DSP in Element Series and Ensemble Thunderbolt audio.
ModEQ 6