AudioFilter.csv?

Seems to be required, according to init sequence generated adb logcat output (see https://bugzilla.mozilla.org/show_bug.cgi?id=945124).

If this looks non-insane, you should probably add it. OTOH, Iit might be insane -  can't see why everyone else would miss this for months. But others reported the same issue on #b2g IRC as per the above URL...