It is a good idea, but if just assume that it would be crystal clear sound of the audio that is played through the dream, there still arise one problem.
And that is also the reason to why we don't get lucid in our dreams naturally in the first place, and that is that the logical center of our brain is inactive.
So even if you hear the sound (I have actually tried it myself), you might just think while you talk to your dream character friends "Oh how stupid of me, I forgot to turn off my lucidity audio trigger", this also the usual main problem with the Dream mask you might have heard of, the practioner just end up finding a way to explain the strange event that they at the time consider as a rational conclusion, but when they wake up they realize that they were actually missing their cue.
There is however one thing that you can do to try to solve this problem, and that is to wake up during the night, go to the bathroom just to stay up for a little time and wake your mind and your logical center of the brain up a little bit. And then go back to sleep with the audio trigger set.
Try it out and see if it gives any result. 
Good luck!
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