Shtar is a device by Shbobo: The neck is marked, with neutral intervals in brass and power chords in steel. 33 frets control computer music, with heart transducer (sensing pressure) and bridge pickup. Two knobs aux Eurorack inputs. Three modes of production: acoustic; add computer music; multiply by computer music (stereo ring mod). USB interfaces to host as does the Shnth. There is a red light.