Harvey Chao wrote:

> Do "reed stops" actually have a vibrating physical element/reed,
> or is it all how the pipe is physically arranged that produces
> a "reed" voicing ?

Yes, they do have a physically vibrating reed, with the exception
of some Estey "Reedless" reed stops.  I found a site which gives
a good explanation:

  http://junior.apk.net/~cam/pipe1.htm
  http://junior.apk.net/~cam/pipe2.htm

Regards,

Bob Loesch
http://www.jps.net/rrloesch