Michael, the Seymour "Z" lever lowers the second string Eb to D, raises the 7th F# to G#, and lowers the 9th D to C#. It is used in conjunction with the lever which lowers the E's to Eb, so it should be on the opposite knee. Bobbe Seymour has some instruction videos which explains the use of these two "magic" knee levers. There is, indeed, a lot of stuff there. If I could only have two knee levers, that would be the two I would want.[This message was edited by Bob Tuttle on 25 November 2005 at 04:42 PM.]