Me also likes the accompaniements of the early Mellotrons.
I had asked at some point already the guys from mellotronics.co.uk who can provide you with the original tapes. However, they told me they ONLY sell them as tapes, no digital version available ;-( So so far according to my knowledge, the only ones available are
from the CD-ROM by Mike Pinder:
Foxtrot/Sax Phrases
Dixie Land/Trombone
Cha Cha/Swinging Flutes
Bungalow Bill Guitar intro
Moving Bass/Cello and Violin Chords (block)
Bossa Nova/Cello and Violins Moving Chords
from M-Tron PRO:
16-18 keys samples (rythms/fills) from the following seven categories:
Bossa Nova
Dixieland
Foxtrott
Samba
Slow Foxtrott
Slow Waltz
Viennese Waltz
Indeed not too many, but that's all I guess. I really would like to hunt down someone who has a MkII to sample them!!
Maybe the Optigan Samples are an alternative?
http://www.optigan.com/content/shoptiga ... ple-dvd-r/