Subtitling in DVDSP

Hawk Teflon

Veteran
This isn't a question on "how to" subtitle in DVDSP. This is a question on the scripting logic of turning the subtitles on or off. There are 96 values to assign to the GPRM for subtitling, and there are 32 languages, correct? If you use the lower 32 numbers 0-31, that's the track for the no subtitles. 64-95 is the track with the subtitles 'on' (given you have that many languages). So my question is why they allotted two sets of 32 for the "off" choice. Why would that be necessary?
 
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