Want to know easily which scales relate to a given chord? Just rotate these 2 attached discs and you will know. It comes with instructions, scale tables and a practical protective case. 10 basic chord types are considered, plus their possible tensions, as well as 10 scale types. An equivalence table for other types of chords is also included. The scales have been classified into Basic (major, melodic minor and harmonic minor), Symmetric (diminished and whole tone) and Special (several Bebop scales, Pentatonic and Blues). Thus, a complete set of scales is available for improvising on a given chord.
Moreover, with the aim of making the initiation to the improvisation easier and friendlier, a set of practical tables containing all these 10 scale types in every key is included. Finally, this instrument together with the scale tables, are designed in such a way that users need not know how to read music.