To further explain, the menu domains (vmgm and vtsm) are allowed only one audio stream, and it has no language. The vob file for menus may contain up to 8 audio streams, all with identical attributes (encoder, channels, etc), but the PGC for each menu will have only one entry pointing to just one stream. This allows you to use the same cells in different language units and have different audio for each language unit. Subpictures are similar except there can be 32 streams, and display modes for 16:9 menus allows up to three streams per PGC, all in the first entry. Now, more to your question. In the menu domains the values of SPRM1, SPRM2, and SPRM3 do not matter, they are used when starting a title to determine the audio/sub streams and angle. The SetSTN command may be used in a title or a vtsm (menu in a vts), but not from the video manager (vmgm).