Soundlevel needs realtime compressor/limiter

My station has an soundlevel problem. Even as the replaygain is correct (I don’t think i have the same problem as mentioned in “Post Audio Realtime Processing Compressor Limiter” the soundlevel does not stay equal.
I just wonder if i could install a realtime compressor/limiter just before the icecast2 server? If that peace of software exists of course.

Maybe something like this can be useful: drakify audio library …but I’m sure more work will need to be done than just plug it in.

I will look into it. Thank you for the link.