A few years ago, I visited an antiques shop in Syracuse.  There, lo and
behold, sat a nice Marshall and Wendell Ampico.  Upon close inspection,
I discovered it had a Duo-Art Tracker bar!  Upon closer inspection, I
discovered indeed, it was an Ampico, with Ampico expression units.

The shop owner proudly told me that the piano played both Duo-Art rolls
and Ampico rolls!  (None of the expression tubing was connected)

Bruce Clark