Since the creation of the MIDI proto- col and the first synthesizers, the large majority of digital musical instruments have been keyboard-based. This ap- proach has therefore helped expand the musical possibilities of keyboard players, given that they only need a MIDI keyboard and a computer to start making music. However, this ap- proach has usually been framed within the western tonal system, which has sometimes led to some musical limita- tions. This Master ’s Thesis is aimed at creating a new digital musical in- strument allowing the same level of ex- pressiveness as string instruments (vi- brato, slide, picking...) and having the flexibility provided by controllers usually found in keyboard synthesiz- ers. Moreover, this project explores how different scales from different cul- tures (such as equal tempered scale, polychromatic scales and microtonal scales) can be integrated within the same device in order to create a flex- ible and versatile instrument.