Thank you all for the explanations.
Dalarna dialect also has its characteristics, besides the melodical accentuation,
which is the consequence of its aboriginal population.
On internet I found the presentation that do the sound changes (Dialectize Text),
typical for the Swedish Chef from the Muppwet Show (and other funny "dialects"),
so I aminterested is there a bit of truth in that joke, how much and by which
attributes Dalarna dialect differs from the speech from the other population:
http://www.rinkworks.com/dialect/
Milos Bogdanovic