In my dreams (Non-Lucid), I can hear perfectly and speak perfectly, same as IRL, but when I become lucid, I cant hear 99% of sounds and have trouble forming sentances. When I yelled “Audio On!”, I didnt have any effect.
Anybody have this problem, and if so, did/how did you correct it?
I can’t say I’ve ever had this problem, but perhaps you could try a few different ideas to restore the audio to your dream. A T.V remote that is in your pocket could be one way. Or how about you take those ear-plugs you have in your ears out. 
If one explanation & solution for having no sound doesn’t work, you could try another. Hope that helps 
Sometimes when senses are missing in LDs, you are on the verge of waking up or at least not “deeply enough” in the dream. If shouting and wishing does not help, just go along with the dream a little. Often the senses reappear without any further effort.
haha thats wierd, last weekend when i had my first LD i had no audio aswell