Please describe the problem:
In the activity,"click the letter", some french letter sounds are: 
-almost impossible to recognize (it seems part of it is cut), it affects the letters: K E I U T S J Q ... then others are ok
- not loud enough, for most of them, should be normalized.

Steps to reproduce:
1. by playing the "click the letter" activity in french
2. 
3. 


Actual results:
high difficulty to recognize some letter sounds

Expected results:
Audible sounds

Does this happen every time?
yes

Other information:
If you can reproduce the bug and new sounds have to be recorded, I can do it if needed, regards.