PWM style compressor

[Paul Perry]

I was looking at compressor sites the other day & saw that there 
have been 2 'classic' compressors based on PWM, in years gone by.
Does anyone kow whether the RNC operates this way? I know there 
is a micro in there (or at least I have been told so).

Also, there was some old valve compressor that used electroluminescent 
panel to change the resistance of a LDR. I can't personally see any 
advantage over using leds, which didn't exist at that time AFAIK.
Any opinions?

paul perry melbourne australia