My 1921 Duo-Art test roll is different from Number 3 of 1927.
In the '21 version the music at the end is Henselt's "La Gondola",
and MacDowell's "Witches Dance".  At the end of Test Roll No. 3
is "Valse in A", and "Indian Love Call" from Rose Marie.  There
are also some differences in the tests.

These test rolls both seem to be better fit to test the standard
system Duo-Art than the fan accordion system.

Bruce Grimes

 [ Four different test rolls for the Duo-Art were published:
 [
 [   (a) Combination Tester -- Pianola and Duo-Art
 [   (b) Test Roll #1, circa 1914
 [   (c) 1921 Electric Duo-Art Tester / Test Roll #2
 [   (d) Duo-Art Test Roll No. 3, circa 1927
 [
 [ Ref. "Duo-Art Test Rolls" by Randolph Herr at
 [ http://www.mmdigest.com/Archives/Digests/200004/2000.04.28.04.html 
 [
 [ -- Robbie