Hello.
When I'm using fm radio everything is working fine and navi sound mix great.
But when I use any other music player, whether it is YT, YT Music or internet radio, navi sounds are barerky heared.
Ive tried to play with system mix setting but it doesn't change much.
Any idea what can I do?
Navigation sound mix
When you set the volume a pop-up window shows up. On the top of this window there are 3 dots. Poke on them and an other window will show up on its right side where you can set the navigation sound directly and independently from the main volume.
Turning this all the way up helped me with the same problem...
Taker666
I know that. And it's working perfect while I listen to fm radio.
But when I listen music from other player as I mentioned before it's not so perfect. Navi sound is way more quiet.
I have tried to play with sound balance in settings. Turning navi volume up there helped a little. Also I was able to volume down music player but then it plays to quiet. So far I managed to get decent mix. Not perfect but it's acceptable.
Kinda wierd you have to play with balance when using apps other then fm radio.
In my car (Honda Accord VIII) other music players are displayed on internal lcd(second small lcd that's shows AC info as well as time and music info) as USB device( I see track number 0/disc 0), while fm radio normally shows fm frequency.
Hi,
You may have already done this, but just in case
- Make sure you have the latest firmware installed
- Settings - HOME - Widgets - Music Tab: assign your main music player as the default
- Settings - HOME - Widgets - Navi Tab: assign your main Navi App as the default
I mainly use Spotify/Waze which I have set as defaults, but I also use outside of the defaults for music - CarPlay, DUDU Radio, Nav Radio+ and YouTube, all seem to lower for navigation notifications.
Matt
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Gwinambele 
Perhaps you should give this feature a try which appeared in the latest update.
Taker666 I have also tried this, it is set at close to max and still no output change on GPS sound
Does anyone else have any other recommendations to get standard level sound across all applications and services. As mentioned above..GPS sound cant be heard, volume difference between radio and youtube app is horrible. I have tried testing all sorts of settings with no change. There are about 10 different sound settings in different locations so I dont know how anyone can make heads or tails out of this....
I thought this was supposed to be a quality UI?
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Taker666 my volume control does not have popup or three dots, just a basic slider. Are you on 3.5? I'm not, so not sure where I can find application specific volume control
You are right, I'm not on 3.5. When I got my unit I had that separate control but when I updated to the latest advertised version I have lost it... what a pity! The problem is as I see it that various apps use separate sound channels present on stock android and those can be adjusted individually, but on Dudu we can not reach these controls. And for a quality OS it is really weird. I would ask the developers to make it possible but still do not figure out how to do so. 
picasso1850 Upgrade to the latest system version
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dudu-langzi Factory system reset did not help me to receive any GPS navigation sounds. I even tried 3.5 and no change. I have configured waze as default nav, changed setting so music doesn't play when navigation talks. I do not know how all the different sound settings impact apps vs stock radio sound. Can you provide any more guidance? Even had navigation sound turned to max in advanced sound settings, no change. 
I can tell the navigation sound information is being received because of radio going quiet during GPS instructions, but still no GPS voice is heard.
picasso1850 Just to make sure you are not overlooking the obvious: is the navigation sound in Waze sound settings turned up for sure? You know, there is a volume slider there too just to make eleven out of the ten possibilties...
Taker666 The sound setting in waze is set to the max
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picasso1850 Then it is checked. You may experiment with the voice settings also in Waze. I had issues with that before, sometimes the voice data gets corrupted or what. Choose an other one to try no matter you dont understand a word and see if it helps or not.
Taker666 no that doesnt solve problem.
Gwinambele I think I better understand your OP now. when you said fm radio works OK, you meant the default system radio/music. When I switched from Navradio back to system default I finally heard navigation voice. Then I test by switching default back to Navradio and no more navigation voice. Ah ha! So i switch it back to system to confirm....no navigation sounds! lol. I wonder if it needs a reboot when you toggle between system defaults.
picasso1850 I'm also using navradio and it's OK. But I also installed radioproxy app for navradio. It disables system radio app so navradio is treaded as default fm app.
And with navradio app playing I hear navi sound loud. With other player much much worse.
Gwinambele
Radioproxy only works on the 7862 and 8581. Not on the 7870.
It seems that nobody makes the distinction here in this forum thread.
surfer63 I wondered if he was on an older version then me. Do you suggest that is why navRadio and navigation sounds do not work for my 7870?
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picasso1850
I can't remember how it works for me on my 7870 with navradio and I can't test before tomorrow.