The ads used to say that the EH-2 adds brilliance, dynamics and presence to your sound. When you first plug in this pedal most people won’t hear any difference in the sound. Keep playing for a while and then turn it off. You will then realize the effect that this pedal has. What it does is to dynamically modify the high-frequency harmonics. This restores the clarity and delicate harmonic structures lost through signal processing with multiple effect units. It is well suited to studio work where it can have a huge impact on the clarity of the recorded sound.