I've check
http://www.osar.fr/protoplug/ and it seems to be working for me well. Will try to do more performance tests later, but currently, all look fantastic.
There are no binaries for Linux, so it should be built from sources, it's better to download the last release
(
https://github.com/pac-dev/protoplug/releases), 'master' branch from the repository (
https://github.com/pac-dev/protoplug) has some compile issues, at least under Mint.
I use gcc 5.5.0 as Juce has a problem with newer GCC AFAIK and Protoplug uses Juce.