I'm sure Bob Taylor is correct in his comments regarding the true
identity of Duo-Art organist "Marvin Abbott".  If proof is needed,
just have a listen to this Frank Milne 1930's Medley Duo-Art
piano roll on YouTube:  https://www.youtube.com/watch?v=zPsmbJY6VG8
 

The introduction to this Duo-Art piano roll is virtually identical
to that on the Duo-Art organ roll of Carroll Gibbons' beautiful
"Garden in the Rain".  Indeed, the third tune on the medley roll
[at time 3:21] is "Garden in the Rain" -- a virtually identical
arrangement, in terms of its harmonic details, to the performance
on the Duo-Art organ roll.

The organ roll is wonderful (especially so in Bob Taylor's new
recording featuring the echo division of his organ).  It seems a shame
that this organ roll is just about the only one produced by Aeolian
in this suave 1930's 'dance band' style; most of the popular music
produced for the Aeolian pipe organ, although excellent, was of a
slightly earlier era and it is good to hear the contrast which this
roll provides.

Rowland Lee
Lincolnshire, UK