At 04:05 PM 6/6/2006, Magnus Danielson wrote: > > The "A" you get from the telephone co is accurate. You could probably run > > it through a filter to get a sine. > >Ehm... only if they actually "play" A. Not all do you know. Oh, well, if you live in some backward part of the world ... I checked here against a tuning fork and it is fine. Ian