I want to build a rehearsal studio of about 20 x 25 next to my garage. It needs to be sound proofed to avoid bothering the neighbors, while sounding good inside. I expect I will do some live recording, but it will be more oriented for playing with friends than being a dedicated recording studio, i.e., I don't need a separate control booth. Any books or sites you can recommend that will help me come up with a functional design? Any mistakes to avoid, based on your experiences? Thanks for any help you can provide.