Very important, when you download the app for the first time, there is quick one time visual tutorial. Do everything exactly what it says to do, if not, won't work. If you can take screen shots of the directions, your better off. After that one time, you would have to un—install and than re—install to see it again. It only comes up right after the initial install.
The only variance is your volume number in the preferences . Test, if it's working, by listening to the preset ring tones in the system settings of the phone.
I was afraid, that I might of had to exchange the phone because the speaker volume was so bad. This app makes a significant difference.
Sent from my Galaxy Nexus using xda premium