I used a hardware one constantly in 1990's when I was a studio recording engineer. Like the mid-‘60s classic, the CLA-2A sounds great on guitars and bass, and really shines on vocals. Each unit is point-to-point hand-wired and built.Lag free. I use this style of compressor as a leveller. Modeled on the legendary electro-optical tube compressor, the CLA-2A emulates the originals smooth, frequency-dependent behaviors that have made it a favorite of engineers everywhere. The Universal Audio Teletronix LA-2A Tube-Amplified T4 Classic Compressor/Limiter features a unique tube-driven electro-optical attenuator system allows instantaneous gain reduction with no increase in harmonic distortion. Great for bass, guitars, keys, and vocals (in conjunction with another compressor like an 1176 if you need to deal with a vocalist's transients).
It leaves transients alone and averages out the signal over time. Gain would make the panel inside brighter optically and then you adjust the peak to control the amount of compression (how much of the light the photo cell responds to). You control it by using the input gain and peak together.
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It worked using a luminescent panel as an input and photocells 'seeing' and adapting the compression ration and release, if the photo cell sees light it continues to work. Waves CLA-2A Compressor / Limiter Plug-in (Serial Download) Computer Music 10 off Virtual Instruments & Plugins - Use code VIP10 Inta-Audio is the UKs. Use the Peak Reduction control to set the amount of compression desired. Using the Compress/Limiter toggle, select Compressor (approximately 3:1 ratio) or Limiter (approximately 100:1 ratio). If it was modelled properly then the attack/release and the ratio are dependent on the source signal but generally the original Teletronix was a 10ms attack time, a 4:1 ratio and the release was around 60ms on quick signals with a further hold from 1s - 15s depending on the signal. The CLA-2A offers 2 main controls for compression, as well as additional controls for fine-tuning.