i have a sound icon here and when i click it, it plays the audio. However it is absolutely wrong. They didn't do a good job with the text-to-speech machine here, this is beside جاكيت is simply an adaptation to the English word Jacket and not a real Arabic word. The Arabic one should be سترة (sutrah), and maybe sometimes معطف (Mi3t^af).
There is sound when you click on the words or the blue speaker icons. However, I been having problems for a few weeks where I'm not always getting sound when I click on the words or icons. Is this what is happening to you as well? If it is, turn in a bug report.