http://tagboardeffects.blogspot.com.br/2016/01/prescription-electronics-experience.htmlI built this pedal today using this layout. Everything works fine except the Swell. When the Swell is activated it is as if you are activating a second output volume preset. I changed transistors, reviewed the board many times, but it did not work. I used 2N3904 for Q1-Q4 and 2N5088 for Q5 and Q6 (I replaced with germanium transistors, 2n3904, Mpsa18, 2n2222)