Ultimate Gear Guides Roland Boss GT-8 Lick Library. This superb 2 DVD set takes an in-depth look at the endless capabilities of the Roland Boss GT-8. Forget about spending hours reading through a manual you may never understand! This DVD clearly explains the many possibilities of the GT-8 including amp modelling, system set ups & hundreds of effects parameters. The A to Z of the possibilities in this amazing piece of kit are explained concisely in an easy to understand manner.