Fantastic App
I just purchased this app as I already own the book ( and others by the Author) and initially had some issues with the sound but I wrote the author and he responded quickly with the reason. Be sure to have mute or silent mode (depending on the device) off. Apparently many apps override this setting but Apple prefers the apps not do that now. Anyway, the app is really well done, very intuitive and includes some licks that you can hear played on a guitar or sax that you can play along with. The entire book is available which I find to be a huge plus.
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