Note that tools are moved to media-sound/jack-example-tools.
CCing last maintainer to add bits to this package as proaudio proj itself hasn't authored any commits to it since 2017. Are you still using or interested in this?
Otherwise I am wondering if we should ponder getting rid of JACK1.
From release notes, emphasis added by me:
"JACK1 still continues in maintainance mode, *we do not recommend its use*. Its release is purely to avoid conflicts with the recent developments."