There's been considerable posting about these which you can find by searching the archives. I easily found one source by searching the archives for <beats mp3> (no brackets)<br><br><div class="gmail_quote">On Wed, May 7, 2008 at 11:23 AM, Matthew Todd <<a href="mailto:toddpianoworks@att.net">toddpianoworks@att.net</a>> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div>Isn't there a website that has audio files of bps? Do any of you know where it's located?</div>
<div> </div> <div>Matthew<br><br><b><i>Robert Scott <<a href="mailto:fixthatpiano@yahoo.com" target="_blank">fixthatpiano@yahoo.com</a>></i></b> wrote:</div> <blockquote style="border-left: 2px solid rgb(16, 16, 255); padding-left: 5px; margin-left: 5px;">
david at <a href="http://piano.plus.com" target="_blank">piano.plus.com</a> wrote:<br><br>> I came across a website that has a nice 440Hz tone, with a great<br>> demonstration of beats between 440, 441 and 442. It's at:<br>
> <a href="http://www.indiana.edu/%7Eemusic/acoustics/phase.htm" target="_blank">http://www.indiana.edu/~emusic/acoustics/phase.htm</a><br><br>> Bottom of the page has the demo. I did wonder whether different sound<br>
> cards might affect the accuracy, but I've tried it on several computers<br>> and get identical results.<br><br>There is no magic way to get a tone that is more precise than the quartz crystal in your sound card. I have a sound card that has a known offset from its calibration in sound generating mode in TuneLab. When I go to
that website and play A400, I get a tone that is off by exactly the amount indicated by the TuneLab calibration. So if you get exactly A440, then you aare just lucky that your soundcard was not very far off.<br><br>Robert Scott<br>
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