When I touch the leads relay lead closest to the edge of the board on the side of the power LED, I get a slight static. I also get a high-pitched squeal when I touch the legs of the trim pots on the input-side of the LDR.
One other place I get sound is when I touch leg 2 of the volume pot with the lead of C1 at the same time. I get full bypass tone and the effect stays on (relay does not switch off.) None of the other pots do anything, but I can drop the volume of the input signal with the volume pot (full volume remains at unity.)