Apple Logic Pro /LogicExpress Discussion

I have a friend who sings opera and wants to make an audition CD.

There's not much singer-less opera orchestral material available out there, and Logic's in the 
picture, so I thought I'd ask.  We could import an operatic track into iTunes, then into Logic.

Are there any available vocal/center-channel plugins available for Logic?

I have worked with Audacity's various methods of center channel removal, and it always 
leaves a tiny residue of the original vocal track.

thanks!

Karl

p.s. I did search for 'vocal removal' and came up empty.  If there's another term I'm missing, 
tell me.  thx