Greg Mayman wrote in a message to Everett Hertenstein:

 GM> The "purists" still insist on tracker action for their organs as
 GM> that gives a direct connection from the keys to the air valves for
 GM> the pipes, and they say that is the only way you can get the pipes
 GM> to respond intimately to the way you operate the keys. 

For my money, the purists can have the trackers.  I can't think of any
piece of organ music that would benefit from a slower opening of the pipe
valve.  Nor am I aware of any music where the composer had indicated that
the valve should be opened slowly. The idea is to get it open and the pipe
playing.

I've never seen a remotely located tracker console, but I can imagine they
could become a real bear.

 GM> many case there was quite a long delay between pressing the keys
 GM> and having the pipes sound. Imagine having to play one
 GM> second ahead of the music...

The Atlanta Fox Moeller organ, electropneumatic, is in such a large
auditorium that there is a half-second delay between key press and the time
the sound reaches the organist's ear.  You can't wait to hear what's
happening, you play the music and ignore the sound.  This is really
disconcerting for me, but a good, prefessional organist can manage it OK.

 GM> I have an article about a fully electromagnetic operated organ that
 GM> pulled about 1 amp on each of the solenoids letting the air into
 GM> the pipes. It was built around 1900, IIRC, but the
 GM> limitations of the power supplies in those days made it
 GM> impracticable.

Most of the stuff in the USA now seems to run between 27 and 31 ohms and is
operated at 12 to 14 volts.

    Everett 
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