hallo all!
built preen fm2.. 
i cant understand on what settings it takes midi in and plays proper patch sound and when it takes in midi and plays harsh sound and then i cant change patch anymore... 
sometimes in rare ocasions it works like fine, but as soon i  LOAD patch, then later on i cant change or reload other patch - harsh sound is back
update:
It works as should, if preen fm2 is plugged in vi usb to PC before i open Ableton.
but problem with changeing patch stays... once i load patch, i cant change it to different presset
anny ideas?