Convert audio tracks between PAL and NTSC

Audacity’s change tempo is the right tool.

And the % values to input are:

PAL -> NTSC: 25 / (24000/1001) = 1001/960 = 1.04270833… ( + 4.270833…%)
NTSC -> PAL: (24000/1001) / 25 = 960/1001 = 0.959040959… ( – 4.09590…%)

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