As I remember it, these settings were contained in usbradio_tune_XXXXX.conf
But I do not know that for sure. My memory is not always clear on things like this.
I will continue to look for my old configs.
But it also seems to me that the tune program had vox setting options back in the ACID version.
I could be wrong about that as well.
I may have a drive with all the old stuff on it if I can locate it. So it continues.