This is a most intriguing "little" app with a surprisingly okay soundset.
Beware - don't click the play button before you tweak the settings as the "stop" function appears to be missing - so you have to force terminate to halt the demo.
As I'm not a virtuoso jazz player I'd find this immensely useful if I had the option to select some/all chords generated in the key - and then build my skill. Otherwise if you're up for it, it does generate a solid challenge. Great concept, hope the developer keeps going.
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