Hi Bill - glad you enjoyed the lesson!

Yes the Ampire is a plug in for your computer that is an amp modeler. It can give you several amp and effect options.

I'd start out with the Marshall 800 model (I think it's called the MCM 800).  The default setting might be close already.  You'll want to experiment with the Gain (or Drive) control on the amp to acheive the desired amount of crunch.

On that song, I set the amp gain a bit on the lower side, and then added a Tube Screamer effect pedal before the amp. This effect emphasizes the mid frequencies that push the guitar forward in the mix.

Don't be afraid to twist all the knobs all around to hear what it does to the sound - this is how we learn to get this stuff sounding good!

I hope this helps - let me know how it goes!  Happy tweaking!

Mike