How about adding the ability to sample Hz for currently playing song? It wouldn't be a big addition to mIRC...
$insong.hz - Returns the current frequency of the song that's playing...
Then using $song(filename).sample to determine the frequency range. Break that in to bands... etc...
Although I don't know if mIRC's scripts would be fast enough to handling sampling a song often enough to make an good EQ possible. As far as the visualizations, that can already be done with DLL's.
Naquada
