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Dear list, this is sounds-001.tex from the examples: \definerenderingwindow [example] [width=0pt,height=0pt,frame=off] \setupinteraction[state=start] \useexternalrendering [mysound] [audio/mpeg] % audio/x-mp3 [akkerman.mp3] [embed] \definereference [StartSoundTrack] [StartRendering{mysound}] \definereference [StopSoundTrack] [StopRendering{mysound}] \definelayer[resources][width=\paperwidth,height=\paperheight] \setupbackgrounds[page][background=resources] \starttext \setlayer[resources]{\placerenderingwindow[example][mysound]} \startTEXpage \button{start}[StartSoundTrack] \button{stop}[StopSoundTrack] \stopTEXpage \startTEXpage \button{start}[StartSoundTrack] \button{stop}[StopSoundTrack] \stopTEXpage \stoptext I added the option to embed the file. I’m attaching the result. As I cannot check it myself with Acrobat for Linux (it seems to lack a player for MP3 files), I asked at the Spanish TeX mailing list whether they can play the MP3 file embedded in the PDF file. A MacOS X user (with Acrobat 9.5) told me that the program reports that the file "akkerman.mp3" is missing. Although the file is indeed embedded, the /Filespec points to the external file. Decompressing the PDF file, I see that there are two similar objects: 8 0 obj << /EF << /F 7 0 R >> /F (akkerman.mp3) /Type /Filespec /UF (\376\377\000a\000k\000k\000e\000r\000m\000a\000n\000.\000m\000p\0003) >> endobj 10 0 obj << /EF 8 0 R /F (akkerman.mp3) /Type /Filespec >> endobj This object contains a strange dictionary (an indirect reference to the same object it contains it?): 13 0 obj << /Type /Annot /A << /AN 13 0 R /OP 0 /R 12 0 R /S /Rendition >> /Border [ 0 0 0 ] /P 14 0 R /Subtype /Screen /Rect [ 0 14.416 0 14.416 ] >> endobj I mean, the object already exists: 15 0 obj << /AN 13 0 R /OP 0 /R 12 0 R /S /Rendition >> endobj Could anyone tell me what I’m doing wrong so that the embedded file isn’t played? Many thanks for your help, Pablo -- http://www.ousia.tk