Black Valve could be inspired by the LA2A, which means that the timing parameters should be roughly “ The average attack time is 10 milliseconds,[5] while the release time is about 60 ms for 50% release and 0.5 to 5 seconds for full release, depending on the previous program material.” (Wikipedia).
I don’t know RVox, but just from the name, maybe. Attack and release are probably rather program dependent, too.