Line 6 (No I don’t have shares in them) Make something called a "Guitar Port" which plugs into your computer. This will play stuff at half speed with out altering pitch. It also (for a small additional fee which made me quite unhappy on principle) provides a library of tunes to play along with minus the guitar hero. Example there is the Wind Cries Mary with out Hendrix re mixed from the original master tape...cool hu !