This solve the problem for me. Now I can listen music, my mp3 player in background and have sound from iGO navigation at same time. The problem was in iGO because if I use Nokia Here GPS with other app mp3 player it works fine, both sound play without stop. But iGO was stopping my mp3 player. Thanks for the fix!
[sound]
android_muting_device=0
also works instead the previous
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