US Patent 7304224 Exercise and training device for acoustic guitar players

A practice and exercise device for acoustic guitar players. The device includes a housing, a plurality of strings, and a circuit to generate a sound having a tone, wherein the tone is selected from the group consisting of A, D, and E tones. The circuit is housed in the housing and includes touch sensitive switches, which are in operable communication with the fingerboard. The housing defines a front surface that in turn defines a fingerboard. The fingerboard includes at least one fret fixed transversely across the fingerboard and visually distinguishable markings. The markings are located at positions on the fingerboard corresponding to tones A, D, and E, and the touch sensitive switches are located beneath the markings.