Here's a nice progression I being playing with hope someone will enjoy. Since a like slow/mellow tunes I play at about 54 bpm.
Eb/Gb-Bb-Db-F
Db/Gb-Bb-Db-Eb or Db/Gb-Bb-Eb
B/Gb-Bb-B-Eb or B/Bb-B-Eb-Gb or B/Bb-Db-Eb-Gb
Ab/Gb-Bb-B-Eb
Gb/Bb-Eb-Bb
F/B-Eb-Ab
E/Ab-Db-D-Gb
Eb/Gb-Bb-Db-F
Db/Gb-Bb-Db-Eb or Db/Gb-Bb-Eb
C/Gb-Bb-C-Eb
F/A-Db-Eb-Ab
Bb/Ab-C-Db-F
Ab/Ab-C-Db-F
G/A-C-Db-F
Gb/A-Db-Eb-Ab-Gb
F/Ab-Bb-C-Eb
E/Gb-Ab-B-Eb
repeat 2x's then hit
Eb/G-Db-Eb-Gb
repeat from top