Lehle Parallel SW II

This does what it claims to and has no negative impact on sound. Its solidly built and looks great. My only niggle are the control dials, they are very flat so hard to adjust and impossible to see at a glance what the settings are. Only a very low visibility dot on each dial to give you a clue. I can see why they are low profile, it is a set and forget sort of device, but during setup it would help to have a little more traction on the dials and visibility.