actually, some wave-files are 'weird' - or protected..
i also have some 'wave' files, that just dont work in any other context than with a special sony-software.
It is possible to add something in the header, that will do some kind of pre-control, before the 'wave' file is played.
Perhaps that could be the case with your t.swift vocal
Is it from a karaokee-collection? Then i could imagine, that something like this controll has been added to the header -Can you play it in any other proggies?
If you upload, i can take a look at it, but it wont help :p