This section provides finctions to play a note, play a sound file and record sounds. The key points when using sound include...

• Some computers cannot handle sound (office computers often have the sound card removed.)
• It is not unusual for a user or adminstrator to "switch off" all sound using the computers system settings
• Sound cards cannot "play" very low frequencies and human ears cannot hear very low frequencies.
  • A typical soundcard will have a lower limit of about 20 Hz, it is likely to ignore lower frequecy requests or remain silent for the note duration.
  • The minimum playable frequency will vary between soundcards
• Sound cards cannot "play" very high frequencies and human ears cannot hear very high frequencies.
  • A typical soundcard will have an upper limit of about 20,000 Hz, it is likely to ignore higher frequency requests or remain silent for the note duration.
  • The maximum playable frequency will vary between soundcards
• Human hearing abilities vary and individuals may not detect every playable frequency.

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