The CB4 has excellent sustain and string balance. Clearly defined notes throughout the registers makes the CB4 the best choice for studio or stage. We also build these in 5 strings versions. The standard tone controls include bass, treble, and sweepable midrange cut/boost. This allows a wider variety of tone choices. 18 volts provides plenty of headroom, virtually eliminating distortion and clipping during "snapping and popping" of the strings.