How play 2 audio files "simultanously"?

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If my audio editor (Audacity) is working on an audio file and my
movie player has a film loaded, then I can't switch between the apps
and hear each app's audio.

I don't want to actually play the audio at the very same time but I
do want to be be able to go to one or the other app and hear its

Why does this happen. Where in the system is this determined?

Most importantly, how do I get the audio in both apps to be

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