Hope it's not a faux pas to bump this five year old ( ) thread, but it's the top Google result for "jeskola buzz midi import" so I figured it was the best place for future people who might have the same question as me.
When I import one particular .MID file using Per's excellently-detailed instructions, the result is a complete blur of notes even at 16bpm. Playing this same .MID file in other players (foobar, etc) plays it at the "correct" tempo.
What steps can I take to resolve this - either by doing something in Buzz after importing the file, or by altering the file itself in some hopefully-straightforward fashion? Obviously, I'm hoping to avoid having to go into Pattern Editor and manually pad it out - not sure my INSERT button could take that kind of abuse!