Testing sans enclosure (cause I haven't drilled one yet):
The looper is so I had both hands free to adjust the JFET bias trimpot, turn the circuit on and off, and adjust the level to unity. I have read of this pedal being subtle, but this is so subtle I can't tell if it's doing anything at all. I am used to the compression built in to my THR (which I turned off for this test), so hopefully I know a little of what to listen for. Hear it I can't. Just a level boost as I adjust the level pot. The JFETs are doing something, cause the signal cuts out when I adjust the bias trimpot to one end of the range, but after 1/3 the signal returns and pretty much stays the same over the rest of the range. None of the distortion that others report at the other end of the bias adjustment.
Fortunately I socketed the 2N5457 JFETS so I can experiment with different ones. Some claim that J201s give more compression. I will try a few things that I have lying around to see what happens.