first thing ... welcome to the site.
Rather than asking a question have you READ the other topics here. There's another thread now that's specifically talking about copying karaoke discs.
I DO appreciate that you mentioned your software and hardware you're using. Most karaoke cd+g copying software requires the burner to be able to read the karaoke subcode.
MTU.com and goldenhawk.com both have a help file which tells you which burners can do that. Now I've HEARD that Alcohol120% will do it (like you tried), but I have no experience with it. I did signup at
http://www.alcohol-soft.com/ on their forum, and did a simple search, and came up with this topic that tells you step by step how to do it.
Note: The link may not work if you're not a member of that site! Registration is free... if you own the product, they'll support it!
http://forum.alcohol-soft.com/index.php?showtopic=15004