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Garmin USA navigation voice too loud when listening to music on iphone 5s

hello,
I downloaded Garmin USA version 2.9(141) for iphone 5s running iOS 9.0.1
When listening to music navigation voices are too loud louder than music.
On the GPS setting I go to settings/audio and display/volume, so I turn down volume but turns down not only GPS voice but music too at the same time.
I can't turn down GPS volume independently from music volume.
How can I turn down only GPS volume?
Thanks a lot!