Vocaloid Terminologies...HELP!!!

It's been a buwan since I got addicted to Vocaloid and up until now I can't understand the ff. terminologies:

- PV
- Append
- 40 meters

So... could you please explain it to me?
Thanks in advance!
 camiile posted sa loob ng isang taon na ang nakalipas
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Anime Sagot

ataro said:
PVs are not just for vocaloids. It simply means promotional video.

Append seems to be versions of some vocaloids that sound madami realistic.

I absolutely had to paghahanap up that last one, but this is all I could find: link

Seems to be a producer.
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posted sa loob ng isang taon na ang nakalipas 
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