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\definerenderingwindow
[example]
[width=0pt,height=0pt,frame=off]
\setupinteraction[state=start]
\useexternalrendering
[mysound]
[audio/mpeg] % audio/x-mp3
[akkerman.mp3]
[]
\definereference [StartSoundTrack] [StartRendering{mysound}]
\definereference [StopSoundTrack] [StopRendering{mysound}]
\definelayer[resources][width=\paperwidth,height=\paperheight]
\setupbackgrounds[page][background=resources]
\starttext
\setlayer[resources]{\placerenderingwindow[example][mysound]} % once
\startTEXpage
\button{start}[StartSoundTrack]
\button{stop}[StopSoundTrack]
\stopTEXpage
\startTEXpage
\button{start}[StartSoundTrack]
\button{stop}[StopSoundTrack]
\stopTEXpage
\stoptext
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