There are three basic techniques in which it is possible to produce multiphonic type effects by combining open string or stopped pitch sounds with natural or artificial harmonics.
Such effects rely heavily on a consistent bow speed and pressure and the bassist will need to experiment to find the right combinations. The three basic techniques are:
In each case, a greater ponticello placement will bring out more of the harmonic and less open string whilst a more natural or tasto position balances the parameters or intensifies the white noise respectively.
Dynamic Range: pp-ff
Barry Guy Statements II