Hi @ChironeX1976,
Welcome to the community! 
I don’t think html.Audio has an elapsed time prop, therefore you can’t get it in the same way you are doing with the input value.
On the other hand, this custom component seems to have a currentTime prop that you can use. I imagine that it can play audio files as well, but I never used it and I can’t say much about it…
Hope this comment at least put you in a good direction to figure out how to do it.