I use a tablet as in car entertainment, playing MP3 output through headphone socket to aux input into ford CD6000 radio.

Been playing with various sat nav software, even deserting Primo :-0, which I have used exclusively in the past.

Sygic seems to do almost everything I want with a nice interface but the real annoyance is the lack of in app volume control. It's just too loud when it interrupts my music.

Has anyone found a solution to altering the volume of the TTS voices?