I think ideally you need a "simple and slow" AGC-like compressor that has a "side-chain gate" so that it can be adjusted so it doesn't "pump up" the level during silence periods that are "supposed" to exist in spoken word.
I don't know what kind of "Radio" station you are running, but you likely will have some sort of processing needed for guarantee legal operation (as well as generating a proper "composite" signal if an FM) which might be able to be able to be adjusted to do this already. If you need to buy one, perhaps the lowest priced Omnia or Optimod products (appropriate for your type of station) would work once properly adjusted to do what you want. Otherwise my vote is an Aphex Compeller, that I think can be "slowed down" enough to give the processing you desire. It certainly has the side-chain gating you need. Overall it is an excellent single-band AGC/Leveler product but does not provide "final radio broadcast limiting" needed for legal operation. If you like to try to do it in software inside your Rivendell box, and have Jack Audio running, there are lots of processor plugins (like ones previously mentioned in this thread) that can be used. I'm using a simple single-band compressor for a web-streamed version of our FM station and have it working great for our purposes (my exact choice would not be best for you as it has no gate, but you might be able to find one that does).
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