Stone Deaf FX EP1The Stone Deaf EP 1 Expression pedal is designed to provide you with the ultimate flexibility in tone control over the frequency of our pedals. You can plug it into any existing Stone Deaf filter to create wah wah, phaser and frequency sweeps across the spectrum of our pedals. So by using this you are eliminate other pedals on your board such as a wah pedal for instance. You can use it to control the tone of your guitar as sound as well making a