Hi fellow MMDers,  Awhile ago I asked if anyone knew what the odd valve
I found in my late Duo-Art expression box was.  I surmized that it was
probably a crash valve.  Since I had no response I will try rephrasing
the question.

Did any of the late Duo-Art pianos (butterfly expression) have a crash
valve ?  If so, how was it operated ?

I look forward to your comments.

Jim Heyworth,
Sechelt, B.C., Canada