Trying some of the other apps mentioned in your links.
fmtools seems to set the tuner but I cannot get it to give a sound output.
http://www.linuxtv.org/v4lwiki/index.php/Radio suggests using sox to record, that creates an output file but it has no sound.
"radio" appears to be much the same as kradio, I suspect kradio is essentially a KDE interface for radio. It plays & changes stations but no way to record. I'm thinking at this point kradio recording is a gui for recording via sox and that perhaps it is not picking up the proper input.