Using seekbar in layers with two audio tracks (only one or the other plays)

Hello, all.

I have slides with layers in which there is only one audio track ('universal' content), and others where there are two (triggered using variables--'country selected').

On the layers with one TTS track, the scrubbing works fine. Understandably on the ones with two, scrubbing doesn't work, as the seekbar hasn't been told which one is being played.

The slides and the interactions between the layers are too complex to allow splitting the content into separate layers. It would be confusing for users to have scrubbing work for some layers and not for others, and I'd rather not disable this function completely.

Is there any way to specify a track (using variables, etc.), and make this work?

Any suggestions are much appreciated.

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