Vantage Sat Nav sound quiet can you adjust it?

[RL17]

Had a look in manual booklet and searched on here and can see posts about it being too quiet and too bossy etc but can't seem to adjust sound up on Sat Nav. Vantage coupe MY16 with sport exhaust/muffler.

Yesterday went from Kent to Silverstone round bottom on M25 way and struggled to hear voice as it mutes audio from old ipod and then speaks very quietly. If I've gone onto currently playing audio display with track etc (so easy to scroll through on steering wheel etc) it's even worse as just mutes track and can't hear a thing. Problem on new tarmac sections at lowish speeds (on the concrete sections can't even hear the song/track). If audio up for songs why isn't the voice also a bit louder.

Music already reasonably loud (louder on way back after hearing GT3/4 cars most of day) so turning up when she speaks not an option. So anyway is the sound adjustable?

[DocW]

You can turn up the volume on the Sat Nav but strangely only when the voice is giving you instructions! So you need to be quick or have your passenger on alert. As soon as she says " take the next right or whatever " turn up the volume. My 2016 Vantage went through the same process yesterday.

[RL17]

thanks I'll have a go tomorrow (as music was already pretty loud I was a bit scared of trying that yesterday)