The original Evolution® Bridge Model did exactly what Steve Vai wanted it to do: kick butt and produce a serious scream. Then he wanted something a little more complex — the same basic tone with increased headroom and dynamics so that the sound kills on 10 and cleans up when the volume is rolled down. With a little less power than the original Evolution®, Evo 2™ balances perfectly with the Evolution® Neck Model and performs equally well with high gain and vintage amps.