Video answer: Minecraft sound fix 1.11 2017 (quick & easy) - how to fix no sound on minecraft glitch
Top best answers to the question «Minecraft audio not working when tabbing out»
If you run into the no sound issue when you play Minecraft, try pressing F3 and S at the same time on your keyboard to force reload the game. If this key combination doesn't work, then try pressing F3 and T at the same time… Wait several seconds and then check if the no sound issue reappears.
Video answer: How to fix the no sound glitch for old versions of minecraft (beta/alpha)