On Sunday 29 January 2006 15:22, Wolfgang Woehl wrote: >Tracey Hytry <shakti@xxxxxxxxxxx>: >> fons wrote: >> > There are several different mechanisms at work here that >> > can make you hear 100 Hz with your test. >> >> See "sidebands" > >Thanks Tracey. Looking for this I came across ><http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html> >again and want to recommend it for it's educational value and >overall freaking greatness. I need to go to school again. All I can say is Amen to that. Thats the best collection of data to settle arguments or to define things I've ever seen. Thanks for the link, its absolutely awesome in todays world of watered down to nearly useless educational blather. -- Cheers, Gene People having trouble with vz bouncing email to me should add the word 'online' between the 'verizon', and the dot which bypasses vz's stupid bounce rules. I do use spamassassin too. :-) Yahoo.com and AOL/TW attorneys please note, additions to the above message by Gene Heskett are: Copyright 2006 by Maurice Eugene Heskett, all rights reserved.