I'll try to answer from what I can gather from their website and from personal lore (the guys are from a town close to my home town and the vocalist-guitarist is a good friend of my bandmate, so we've been following their career for quite a while now
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ah let's say.
whats the lyrics are generally about ?! and why this decision of finnish only ? is it motived by something ?
Like Torniojaws said, the lyrics are often about the human psyche, the faults of the society, politics and things that aren't right in general. Lots of introspection, too.
They actually used English at first, but changed to writing in Finnish somewhere during the change of the millenium, since there weren't many hard rock or metal bands that sung in Finnish at the moment, and in addition to feeling more natural it seemed like a good way to stand out from the other bands.
the guitars they used. i saw the singer with a ESP explorer like 7 string. and the lead guitarist used Ibanez. just the neck of the guitar he's holding here :
http://www.stam1na.com/index2.php?p=kommentit&l=en
gives me GAS.
Yeah, Hyrde (the vocalist) has two ESP custom shop baritone axes. He has also played at least with a Washburn (more about that later on) and an LTD SC-607. Before he changed to using a 5150 (could be he's actually using two now), he had a Randall RH100 head with a Randall 4x12 cab that I bought and later sold at a gas station coffee table for 50 euros
Pexi has several Ibanez's, the website lists a Custom RG7, Apex 1 and Universe UV777BK. He has a Dual Recto and a Stiletto Deuce through two Recto Standard 4x12 cabs. I think he's also had a JEM. They use the A-D-A-D-G-B-E tuning.
anything you about the production would be nice too.
thanks again Jarkko!!!
There are production diaries on the page in Finnish, but unfortunately the diary for the first album (which is my favourite of the three) isn't available anymore. If my memory serves me correctly, they used a Washburn guitar (Idol-series?) with SD pickups on the album, since a good friend of mine bought the guitar from Hyrde and still owns it. Not an expensive axe, but plays really nice and with EMG's changed in I really dig it. That's all I can tell about the first album :/
I didn't have the time to go through the other diaries right now, but IIRC the second album - Uudet Kymmenen Käskyä (The new ten commandments) - was done in Music Bros Studios in Imatra, tracked and mixed by Miitri Aaltonen (and I'm pretty sure the first one was, too). The newest album - Raja (The border) - was done at Purple Fly Studio (which I think has already gone down) in Lemi, tracked and produced by Janne Joutsenniemi, though I think Aaltonen did the mixing on that one, too.
Someone please correct me if I'm wrong, couldn't check all the facts atm!
I really disliked the guitar sound in UKK- album but on this new album all is ok. Those vocal harmonies relly remind od Devin, but that's ok. 
