Found this on Youtube-  Dweezil demonstrating Native Instruments’ Guitar Rig software.

Any guitar sound that you like can be created, stored and emailed to your friends using your computer, not your amp. Guitar Rig is a plugin for popular sequencers/recording software. 

 It’s kinda cool to hear Dweezil play Van Halen then one of his dad’s old solos.  His 2nd tour (Zappa plays Zappa) is coming to play a concert in Atlanta in a few months…I wonder if the wife would go.   Hmmm….