refine docs on play-sound
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@ -324,24 +324,24 @@ Plays a sound file. If @racket[async?] is false, the function does not
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On Windows, only @filepath{.wav} files are supported.
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On Windows, only @filepath{.wav} files are supported.
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On Unix, the function invokes an external sound-playing program;
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On Mac OS X, Quicktime is used to play sounds; most sound
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looking for a few known programs (@exec{aplay}, @exec{play},
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formats (@filepath{.wav}, @filepath{.aiff}, @filepath{.mp3}) are supported in recent versions of
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@exec{esdplay}, @exec{sndfile-play}, @exec{audioplay}). In addition, a
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Quicktime. To play @filepath{.wav} files, Quicktime 3.0 (compatible
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with OS 7.5 and up) is required.
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On Unix, the function invokes an external sound-playing program---looking
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by default for a few known programs (@exec{aplay}, @exec{play},
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@exec{esdplay}, @exec{sndfile-play}, @exec{audioplay}). A
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play command can be defined through the @ResourceFirst{playcmd}
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play command can be defined through the @ResourceFirst{playcmd}
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preference (see @|mrprefsdiscuss|). The preference can hold a
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preference (see @|mrprefsdiscuss|). The preference can hold a
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program name, or a format string containing a single @litchar{~a}
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program name, or a format string containing a single @litchar{~a}
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where the filename should be substituted---and used as a shell
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where the filename should be substituted---and used as a shell
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command. (Don't use @litchar{~s}, since the string that is used
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command. (Don't use @litchar{~s}, since the string that is used
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with the format string will be properly quoted and wrapped in double
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with the format string will be properly quoted and wrapped in double
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quotes.) A plain command name is usually better since execution is
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quotes.) A plain command name is usually better, since execution is
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faster. The command's output is discarded, unless it returns an
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faster. The command's output is discarded, unless it returns an
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error code---in this case the last part of the error output is
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error code, in which case the last part of the error output is
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shown.
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shown.}
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On Mac OS X, Quicktime is used to play sounds; most sound
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formats (.wav, .aiff, .mp3) are supported in recent versions of
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Quicktime. In order to play .wav files, Quicktime 3.0 (compatible
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with OS 7.5 and up) is required.}
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@defproc[(position-integer? [v any/c]) boolean?]{
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@defproc[(position-integer? [v any/c]) boolean?]{
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