I recently bought a DUDU7 12/256 Gb, 9.5" unit for my Suzuki SX4 AERIO 2008 along with the appropriate fascia and connection cables. The unit is incredible but I face a small problem. I use the Sygic navigation instead of Google maps and as I have seen the volume of the instructions voice is pretty low even if I turned the app volume to highest inside DUDU7 menu (GPS volume). I tried everything with no significant improvement. Can you give me a solution?