The Spark is probably my favorite clean boost pedal. I had the Spark mini and upgraded to the full size Spark for the additional tone-shaping capabilities. The Spark has the cleanest gain I have ever heard to add to your tone. If you want a little dirt in it, all you have to do is crank everything up a little higher. I put it before my overdrive pedals to give them a little extra crunch and make them sing. The Spark doesn't do anything to color your tone, only add that needed punch.