Dolby A encoder.

[effitall]

I think the building blocks are out there, but could somebody assemble one of these for me?

Here's effectively the deal:

All filters 12db/Octave
All comps 1ms Attack, 10ms Release Thresh -50dbFS

In --> 80hz LP --> no comp --> to mixer
--> 80hz-3k BP --> 2:1 comp (+10db gain) --> to mixer
--> 3k HP --> 2:1 comp (+10db gain) --> to mixer
--> 9k HP --> 1.5:1 (+5db gain) --> to mixer

Sum the outputs.

The Loser Split/Sum FX maybe form the first and last stages. Then a few fixed compressors in between.

Controls:
Maybe add a controls for the threshold and output of the individual processing bands. Maybe add a mute per band?

Anybody game?