SampledAudioNode rewrite doesn't call onEnded callback.

[William Gooch]

Currently, the ex_playback_events example doesn't function because the onEnded callback is no longer called from a SampledAudioNode when it finishes.

[Nick Porcino]

Thanks for the report!

[Nick Porcino]

@william-gooch Fixed! 15220ea LMK how that goes for you.

[William Gooch]

@meshula That's perfect, thank you!