I CAN'T FIGURE OUT HOW TO CONTROL THE BOOST!!!! When i switch on the wah, my volume gets boosted like crazy!! piercing even. . . i have turned the bottom boost knobs to both extremes and the peak boost is still there, it just seems to change the bottom boost. . . anyone know what i'm talking about and how to adjust it or atleast have some more control over it. . . i got it used with no book.