Guys it does work. My GN is close to the OG.
This is how i did it:
Get full version and install or try with free version or go to dev page somewhere and get the free full version.
-Then after install go to phone settings and under sounds switch to volume + from music fx.
-Go to native google music and play a good quality song and keep it playing and open volume plus app.
-Put volume on phone by way of volume rocker and set it to 2 steps below max.
-Now in the app while your music is playing for starters stick to simple raise volume for speakerphone.
As you increase through 1,2,3....goes to 15, youll here music getting louder as its playing.
Now im on 10 but do what you think is good. Remember as you set your level your still at two steps below your max on phone.Why do this ? Because everthing you play or phone plays out of speakers is different and it alows flexability in increasing lower quality or lower sounding audio, example is
navigation speech ( now its loud before it was unexceptable ).
Ok last thing but most important make sure you have correct volume app > volume+ no spaces icon is a black dial. I was trying for a few days but i had wrong app. Lol of course it didnt work , the only sliders you should see are equalizing sliders for custom volume level enhancements.
You only have to be rooted for one option and i believe its for ear volume.
Hope it helps.
