I have identified two of the unknown tunes on Jack Conway's APP rolls:

1845-4 is "Because of You (The World is Mine)", words by Walter Hirsch,
music by Ted Fiorito.

1845-5 is "Honey, I'm In Love With You", from the 1925 Broadway show
"Mercenary Mary", words and music by William Friedlander and Con Conrad.
(A recording of this tune is on YouTube.)

I don't claim to have a photographic memory for music.  I found these
tunes using a method that is often successful when a portion of the
tunes on a roll are known.  According to the Billings QRS Rollography,
the three known tunes on APP 1845 were issued in July and August of
1925.  I looked at the other tunes issued by QRS during that period,
trying to isolate titles that fit the chorus of the sound clip.

I then played the candidate piano rolls and found these missing titles.
1845-4 is QRS 3182 and 1845-5 is QRS 3169, both issued in August, 1925.

Gary Watkins

 [ Good research, Gary.  Here's the correlation:
 [   QRS 3160 7/25:  1845-2 We're Gonna Have Weather (Whether Or Not)
 [   QRS 3168 7/25:  1845-3 Pal Of My Cradle Days - Marimba Waltz
 [   QRS 3169 8/25:  1845-5 Honey, I'm In Love With You
 [   QRS 3176 8/25:  1845-1 Collegiate
 [   QRS 3182 8/25:  1845-4 Because of You (The World is Mine)
 [ -- Robbie