Plex was my first baby. It was one of my first attempts to do something webby-appy that is more than a static HTML page or a site underlaid by some CMS that does all the tricks for you.
It was developed by the time that the first early Web Audio implementations shipped with Chrome.
The UI is a mess, as is the code, some stuff doesn’t work anymore. Maybe I’ll find the time to fix the broken stuff, but don’t expect anything but a relict toy.
But hey, maybe in 10 years or so this is a classic like http://www.warnerbros.com/archive/spacejam/movie/jam.htm is today.
PS: Use JSHint.