Hi, I am considering, as suggested by harmony central feedbacks, tweaking the trimpot of a MIT CE-2 to increase its depth. Now that I have the schematic downloaded from
On the schemtaic the trim pot is located far left close to the input jack and marked as "VR3".
But believe me: it doesn�t change the depth of the chorus! It�s more a bias control for Q1 as far as I understand the schemtaic. In fact the chorus effect stops if you turn it completly to one direction and only the dry signal comes through. From there on turned in the other direction the chorus comes back again at a certain point and after that nothing happend with the sound exept you probably get some bad distortion, at least with my CE-2.
The trimpots in the BBD based pedals are mostly for bias and clock frequency adjustment. Touching these is normally not a good idea. As lightburst already mentioned, the result is usually silence, more noise or a distorted signal.