Add callback for communicate.save()

[kency]

some likes after it saved the mp3 file ,i need play it ,or do sth with the mp3 file,so i need write a callback function for #save.finish after save completed
Could u give a callback for communicate.save() , some likes communicate.add_callback.....or communicate.callback=...

[rany2]

Hi, if you add this and make a PR I won't reject it. But I don't get why you'd want to do that versus just:

await communicate.save("a.mp3")
do_something_with_mp3("a.mp3")

[kency]

got it