Whatsapp issue on CM12.1

Hi, I installed official CM12.1 on my s5 (G900F) and it works fine, but i have some issues with the vocal messages on whatsapp. The audio is really low. I found a guide on this forum, about the Note II, but it didn't works -.-
So, what I should do? I'm really enjoying this Rom, but this problem with the audio...

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