Overview
 About the Sound routines:
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 There are a few simple Sound routines available. Their usage can be seen
 as a replacement to the Tone() function from Clipper, as these routines
 allow the use of Multiple sounds, without stopping the speaker.

 Note also the availability of two delay functions, XPdelay() which is
 machine independant, and XPdelay2() which allows much tighter delay's
 to be used, but is dependant of the speed of the Machine.

 Use these routines only on ATs, as I have had numerous comments on
 XPsound() not working quite well on XTs. I must admit that I have the
 havit of QUITting the Application when it is not at least an AT,
 so I hardly do any testing on XTs, but apparently, they do not work
 perfectly.