I noticed that many realteks have a voice removal function
look for the karaoke symbol to toggle it on and off
and the accompaning adjustment -4 to +4 range (no idea what it does)
might be worth a try if you want to remove vocals
Is the effect applied when recording, or only on playback?
dont know cant say
never used it
i just observe that it is there
i would presume that it tries to remove voice
when you are doing playback
andor
stereomix so you can overdub your singing
but
maybe it works if you are recording a track
so you would have the music only
someone with realtek who cares about karoke should try it
i have no docs or help for my realtek
There is some information about vocal removal on the Audacity wiki:
http://wiki.audacityteam.org/wiki/Vocal_Removal