I thought this was a cool piece of technology for either the solo act performing artist or jammin at home. Even better than Guitar Pro. Its called the JamVox, by Vox (duh?!). It removes guitar or vocals if you choose. Well heres a link and you check it out for yourself.
The link on top is the demo video. Link on bottom is main Vox website.
http://www.myjamvox.com/videos.html
http://www.voxamps.com/jamvox/
"Listen, you can play up here, but uh..you just can't play better than me..because I'll have to kill you." - Steve talking to Yasi onstage in Ulm, Germany