Hi, I just got hold of an original Mxr flanger. Its the one that has four controls (manual, width, speed and regen) it is dark grey, has a built in psu and is about 5x4 inches. The problem is....no flanging! It appears to be working ie. It lets sound through in both fx and bypass modes and the red LED lights up when the fx is enabled but there is absolutely no effect. Hmmmm very strange. Please please please can anybody help me?