Hi neggard, its easy to change the sound files yourself
Heres how:
1. google search "alert alarm button sound wav samples"
2. download the wav files to desktop
3. got to location of xfeeder
4. rename the wavs on desktop the same as the wavs stored in xfeeder file
5. drag them from desktop into xfeeder folder and "replace"
This now has the new sound files, and the xfeeder program can recognise them