Function Tone() Foundation
Produces a speaker tone with specific tone frequency and duration.
Tone( <nFrequency>, [<nDuration>] ) --> NIL
<nFrequency> is a positive numeric expression which indicates the frequency of the tone produced.
The optional numeric argument <nDuration> specifies the duration of the tone in 2/18 second increments. The value 9 for <nDuration> produces a tone for a duration of one second.
The return value of Tone() is always NIL.
The environment function Tone() produces a tone signal to alert the user to a specific program condition. Common program conditions for which tone signals are useful are reaching the start or end of a file, termination of a timed procedure or when the user has selected a control element not available at that time.
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