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<DIV><FONT size=3D2>Bill,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Another excellant article. May I add the following=20
comment:</FONT></DIV>
<DIV><FONT size=3D2>It might be useful to mention the addition of a referen=
ce=20
recording of a tuning fork or tone of known frequency to aid calibration of=
=20
tapes produced on analogue tape recorders etc. It could be a tuning fork or=
a=20
tone of known frequency, for example the hour pips on Radio 4 are bursts of=
tone=20
at 1000Hz.</FONT></DIV>
<DIV><FONT size=3D2>Dave</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
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