You have to set iGO as default navigation App in your device.
Than you can"play" with sys.txt settings
[android]
; SELECT AUDIO STREAM:
; 0 - STREAM_VOICE_CALL
; 1 - STREAM_SYSTEM
; 2 - STREAM_RING
; 3 - STREAM_MUSIC
; 4 - STREAM_ALARM
; 5 - STREAM_NOTIFICATION
; 6 - STREAM_BLUETOOTH
; 8 - STREAM_DTMF
navigation_audio_stream=4
or delete complete these lines
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