Here is the zipped file
Well, nothing jumped out at me to be incorrect in your programming, so you may be receiving some type of interference on your end.
Here is the zipped file
lets get a recording of this supposed "clicking noise", that might help getting you an answer to your problem.
can you lift the camera higher and show the display ?
I wonder if the Muting function of the audio driver chip is hung/not working and the audio Amp is left in an idle mode while the radio is scanning??
If you pause on a non active channel/talk group, do the noise stop? If so, I expect there is a problem in the audio section of the scanner??
Either a problem ground in the scanner or possibly a problem with the Mute section of the audio path.
I only notice it on scanner apps, when it's close to ear, or real quite room.
It is the scanner apps that have an automatic level control that raise the volume when there is no sound so that all background hiss and clicks become much more apparent.
/Ubbe