Play WAV Simultaneously and Sequentially

I am trying to write an Excel macro that calls a series of sounds based on the content of three cells. I have succeeded in doing that.

What I need to do now is play one of those sounds, then simultaneously play the others in sequential order.

Here is the code I presently have:

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What do I need to do in order that the first line runs at the same time lines 2-7 are running sequentially?