The worlds first established system of it's kind. Used by thousands globally. Save hours of rehearsal time with the JamSpeak "hand signals" technique. If you like the idea of getting more done at rehearsal and having a clear way to communicate "song changes" and "dynamics.."..........if you've ever had a cluttered jam and wished you could get some "space" happening......or just wanted a clear way to signal an "accent" or "tight ending..".....then read on........ Put simply, JamSpeak is a one-hand sign language for musicians to signal the changes in music. Just signal the changes and dynamics...