I apologize if this topic has already been covered.  I checked the
MMD Archives and found that most tracking problems cited occurred on
rewind.  My problem is during play.  My former Duo-Art had the floating
tracker bar and I never had this problem.  (I really liked the floating
tracker bar.)

My "new" Duo-Art is an earlier piano with the roll shifter and
external tracking ears.  My problem is that when playing original
rolls, fairly often the shifter pneumatic tries to move the roll
so far that the paper between sustained notes of chords buckles into
small wrinkles or ridges at the tracker bar.  This produces discords
and in many case breaks the fragile chain bridges.  This piano had
undergone what was called a full restoration.

The play brake is fairly loose and I think if it were much lighter
it would lead to loose paper on the take-up spool and too many pauses
as the take-up gathers up the resulting slack.  I have polished the
tracker bar.

I wondered if the flanges on the take-up spool had been expanded
allowing the paper to shift on the take-up more than it should.
I measured the distance between the flanges and it is exactly the same
as on my floating tracker bar piano.  Were the flanges closer together
on earlier pianos?  Would this help?

I always tap the paper down onto the right hand flange and tighten it
a bit before playing.  I keep the left hand roll flange a little away
from the edges of the roll, but this is to help on rewind.

Has anyone else experienced this problem?  Does anyone have a suggested
solution?

David Sharpe
Western Massachusetts