Hum, you should not need to change the order of the audio streams to force a specific stream by default. Furthermore, you have to change all SetSTN commands in the DVD to take the new stream numbers into account. Anyway, verify if the Audio menu still works as expected, or restore your backup. :) Unfortunately, it is not easy to explain how to force a specific stream, as the method depends of the authoring of the DVD. There is however a simple method, if you can live with some tiny drawbacks. Use Jump To PGC Upon DVD Insert to set your default streams up. See . Pay attention to the tip in step 9. The drawbacks are: everything that is normally played before the main menu will be skipped (including the menu intro, if any), and the same streams will always be selected by default, regardless of the configuration of the player. If you prefer the hard way, you should use the trace to locate the SetSTN command(s) that is (are) executed before you reach the main movie, and change it (them) to suit your needs. (Set a SPRM Write Breakpoint on SPRM 1 to locate the SetSTNs easily.) Doing it can be easy if the SetSTN command force a specific stream, but if it is an indirect commands (using a GPRM instead of a stream number), you will have to start the trace again to locate the Set command that initialise the GPRM that is used to hold the stream number. (And in that case, set a GPRM Write Breakpoint to that GPRM.) Good luck!