Samsung S5 is also called SM-G900F. So I have only one Smartfone and I know nothing about rooting........Android 5 is used in millions of smartfones.
Am I the only person using a Samsung smartfone for RRC nano ? when I use skype with my son or other persons they tell me that it sounds perfect. So it seems, the question is where the audio is picked up in the smartfone or in the RRC micro and if it is the same level that is transferred to the RRC 1258 and fed to DAC.
I should not change audio in the smartfone as it works normal there. The RRC micro has many settings to influence audio and bandwith. Someone in your company must have tested the audio output that goes from RRC1258 to analog mike input at radio.
The audio output sounds like from an overdriven speech processor. Please ask Micke if he has received any signal from a nano user in his radio receiver.
Best regards, Peter
And to answer your questions:
Samsung is the largest Android phone manufacturer so you are surely not the only Nano user using a Samsung phone. However, you are so far the only one that has that kind of audio problems (and reported that to us)
Likewise goes for Android 5, it's so common that you surely are not alone using Nano on that version.
And yes, we have of course tested the audio and its level as we would not have been able to release Nano at all if that had been a general problem.
For us it is really difficult to try fixing something we cannot reproduce ourselves. Without being able to reproduce we would have to resort to release trial-and-error versions for you to try, and that would be time and resource consuming. But rest assured we are trying to find out what more there is to do as it is important for us to have the Nano app working on as many phones as possible.