I use xprivacy to set all permissions on my phone, but I accidently forbid the tuner app to access my microphone.
Which setting do I have to enable?
I found out via xPrivacy itself:
I run the tuner app and after I saw in the privacy settings for the app, that it tried to access
"Medien (Audio,Fotos,Videos)" -> "startRecording" (one minute ago)
I allowed that and now it works ;)