Arco Mobile is a special technique in which a sustained pitch is subjected to small variations in bow pressure whilst continually varying the bow position over a wide range of placements. By varying the range of placements of pressures, a wide range of overtones are produced in addition to the fundamental resulting in a continually changing sonic spectrum.
The possibilities of this technique are quite wide ranging and a great number of overtones and timbral effects can be produced on a single, sustained pitch. It is most effective at lower dynamic levels when the string is not fully vibrating which allows for a greater number of overtones to emerge
Dynamic Range: pp-f
Stefano Scodanibbio Alisei (1986)