Using GST_TAG_TRACK_NUMBER for selecting tracks / subsongs?

[Carlos Rafael Giani]

Hello,

I was thinking of ways to allow application to select subsongs with my 
nonstream-audio plugins ( https://github.com/dv1/gst-nonstream-audio ). 
Then I stumbled upon GST_TAG_TRACK_NUMBER. Does it make sense to inject 
this into the pipeline and use that to select a "track" (= subsong)? Or 
is there a better way? I know of the TOC setter, but do not see how this 
would help with selecting the current subsong.