Your idea of putting the audio files on separate layers is probably the simplest way to do what you want. Then add triggers on the base to show the appropriate layer when the timeline starts based on the value of your character variable.
If you need to keep everything on the base (for example, because layers are used for other content), you could do this for each audio file:
- Add a trigger to pause the audio when the timeline starts.
- Add a trigger to resume the audio when the timeline starts, with a condition based on the value of the character variable.
