This is a great app....
..but how can you possibly have an app that touts itself as a complete guitar reference and NOT cover the blues scale is beyond comprehension. The free app covers it so I have to jump in and put of the paid app whenever I want to hit the blues side. You really should fix this oversight. Would have been a 4/5 but for this major miss.
Yakutz about
Guitarist's Reference, v5.4