WHATSAPP ISSUE AFTER SOUNDABOUT INSTALLATION

Hello,
I have just bought SOUNDABOUT PRO but I'm having a big problem. I only changed notifications and ringtone when I have wired headset, actually when they are in , notifications and ringtone should ring only in headset and not in phone speaker too. However now if I listen a voice note of Whatsapp, I can only listen it by phone speaker and not by earpiece(I don't know if it is called in this way, I mean the part you listen when you have a call). How can I fix?