Your sounds aren't playing because your sound names include the .webm extension. When you use the play by name method, don't include the .webm in the name of the sound. For the game as it is, you don't need to remove all the .webm extensions from the list of sounds. You can just do this:
-> Audio: Play replace(DataN5.At(5,index), ".webm", "") not looping from Sounds at 0 dB (tag "")
The replace statement will strip the extension off for you.