Soundtouchjs support for pitch & tempo

[naomiaro]

• integrate https://www.npmjs.com/package/soundtouchjs
• close Alter playback speed? #19

[sanbaideng]

speed up is a good feature，thanks，

[p-himik]

@naomiaro If I understand correctly, the commit has been completely reverted. Was there something wrong with soundtouchjs that made its use unfeasible?

[naomiaro]

@p-himik It's limited to work with only one track that I saw at the moment.

[p-himik]

Oh... but at least it sounds like we can have a pitch shifter per track with all pitch shifters not being a part of the API and being controlled in a centralized manner from Playlist. Would you consider a PR like that?

[naomiaro]

The timing would drift with this library, it doesn't support time synced shifting of more than one track. A change to soundtouch js would have to be done itself.