Pipe organs-Obviously have pipes and all the proper mechnisims to controll them.
Digital-These organs have "computers" inside of them so as over time the sound will not diminish. I have a 30 year old Allen organ and it still sounds as good today as it did new.
Electric organs-not exatly sure.
Theater-Very much like pipe organs, but usually have a lot more bells and whistles on them, litteraly. THey have percussion instruments on them, and are made a lot for show. Back when it was to expensive to have a whole orchestra come in and play the music to a silent movie, then they would have a theater organsit come in and play. That is why they needed all the extra percussion insturments that they do not have on church pipe organs. In the old westerns they might need the sound of a horse coming, since when do you need hooves in a church? I've never had use for them, but the theater organs had bells and whistles, and all sorts of stuff on them.
--DR LO
