BOLDER Sounds has released Button Accordion, a free sampled instrument for Kontakt and EXS24.
The button accordion was multi sampled approximately in minor 3rds. In the photo you see the 2 rows of the melodic buttons (21 of them) and on the bottom you see a set of buttons which create octaves as well as other intervals. Two different notes are produced for each button depending on whether you are moving the bellows in or out (much like a harmonica).
The samples are in 16 bit stereo format (dithered from 24 bit), and the entire sample set is about 25 megabytes.
Download this and other great freebies for Kontakt and EXS from BOLDER Sounds.
Check this Kontakt freebies list for more free instruments for Kontakt.