Well this is my first post and I'm not too sure if this is the right section to ask it, but have mercy if it's not

Basically what I'm trying to do is get these karaoke VCDs, and burn them onto a DVD cd.

The situation is that my parents love karaoke and they have a bunch of VCDs. Though, we got a new car, but it can't play VCD's (but has 6 DVD CD holder), so they want me to help them.

But something they also want me to do is somehow either:
1. Remove the voice (leaving the music) on the songs, or/and
2. Make the voices/music lower, as in the song actually being scaled down a few notes or something.

I've been able to get from VCD to DVD using VirtualDub and then Nero to burn them, but is there an easier/faster way?

All hints, tips, suggestions, anything is appreciated. Thanks.