Sound

I love this app i think is very helpful and i have been learning a lot but the last update i did of it it said that they fixed some sound issues (which i didnt think it needed it) but when i run the update the sound is now really bad. Can you please help and fix it for real this time??
Thank you

Luevanossoulemont about French Vocabulary 24/7 Language Learning, v4.2.6