Hi John, Tom Binnall here.  I've encountered that Art Echo system
in a Hardman grand here.  Rolls are scarce but, without much effort,
swapping out the expressions for Ampico 'A' works well, leaving the
tracker bar alone.  I don't recall now if re-roll is in the same place;
it's been about seven years since I did it, and the owner was thrilled
that the piano could again be used without listening to the same few
rolls all the time.

Cheers,

Tom Binnall
Seattle