That guy probably did home recording then had an engineer edit and tweak each track and wav file individually, just like in a studio except the takes are all done onto a home pc then burned to dvd and reuploaded to the studio work station. If you are thinking of doing that it then it is advisable to keep a number of takes of each riff/solo as the engineer may decide to edit and splice some parts because of timing or an unrepeatable lick. Everything needs to to be recorded at the highest possible bit rate in mono and saved as high quality wav files. Don't do any destructive manipulation of files eg effects, compression or normalisation if you want to get the most from the engineers experience. Hope that helps!