Spruce no longer exists, so he can't get a manual from them. And finding one on the net is virtually impossible unless you are willing to chance the torrent sites.

I did find a couple of guides to using it that might be helpful: http://www.geocities.com/eaussie01au/maestro.html

http://www.geocities.com/eaussie01au/maestro2.html

http://www.doom9.org/index.html?/mpg/maestro.htm

You might consider DVDLab Pro as a comparable substitute. Maestro is getting long in the tooth now, and has no support.