Add a check to wait for Audio Events to finish before continuing to the next event

[cwchunwei]

Problem

Audio Events don't have the option to wait to finish currently.
If we want 2 audio events to play one after the other, we need to add a wait timer inbetween.

Solution

I would like to have the option to wait for audio events (Sound, Music(?), Voice) to be finished before going to the next event.

Context

One particular use case for me is when I want to have 2 audio events happening one after the other, and being able to not have to put wait timers would be great to decrease clutter, and minimize manual labor of finding out the duration of each sound and putting the wait timer.