Ed Hayden mentioned in his 980910 MMD posting that he had a 1921
Weber Duo-Art with a transposing tracker bar.  I'm quite curious
about how the  transposing bar on the Duo Art works.  Any pictures
of the parts?  Does it play notes in the extreme bass or treble
normally outside the 80-note Duo-Art range when it's shifted?
Would Ed or others enlighten?

Dick Merchant