gnu: sdl-mixer: Describe runtime configuration.
* gnu/packages/sdl.scm (sdl-mixer)[description]: Add information about runtime MIDI playback options. Signed-off-by: Danny Milosavljevic <dannym@scratchpost.org>
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					@ -281,8 +281,14 @@ WEBP, XCF, XPM, and XV.")
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    (synopsis "SDL multi-channel audio mixer library")
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					    (synopsis "SDL multi-channel audio mixer library")
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    (description "SDL_mixer is a multi-channel audio mixer library for SDL.
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					    (description "SDL_mixer is a multi-channel audio mixer library for SDL.
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It supports any number of simultaneously playing channels of 16 bit stereo
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					It supports any number of simultaneously playing channels of 16 bit stereo
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audio, plus a single channel of music.  Supported format include FLAC, MOD,
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					audio, plus a single channel of music.  Supported formats include FLAC, MOD,
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MIDI, Ogg Vorbis, and MP3.")
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					MIDI, Ogg Vorbis, and MP3.
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					This package supports two MIDI backends, selectable at runtime.  To use the
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					newer @code{fluidsynth} library, install a soundfont such as @code{fluid-3}
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					and specify it using the @code{SDL_SOUNDFONTS} environment variable.  For the
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					legacy @code{timidity} backend, install a patch set such as @code{freepats}
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					and set the path to the configuration file with @code{TIMIDITY_CFG}.")
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    (home-page "https://www.libsdl.org/projects/SDL_mixer/")
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					    (home-page "https://www.libsdl.org/projects/SDL_mixer/")
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    (license zlib)))
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					    (license zlib)))
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