Fix bug with sprites and playbackRate
When using sprites, the library would crash when either the volume or playbackRate changed. In development, it would also crash during hot reload.
I spent about half an hour digging into this, and wasn’t really able to find a proper fix. The band-aid I came up with is to ignore changes to playbackRate when sprites are used. This means that if you have a dynamic playbackRate in your application, you can no longer use sprites, and will need a separate useSound instance for each sound effect.
The problematic line in question is this: https://github.com/goldfire/howler.js/blob/master/src/howler.core.js#L1564. From what I can tell, sound._sprite resolves to _default instead of the actual names of our sprites, which causes an exception. If anyone feels like digging into this and comes up with a fix, please let me know by email at [email protected].