> - is this a sorta secondary stress (much less prominent than the main one

on

> y)?

I don't think something particularly Lithuanian should be searched for in
here. Speaking any language that has words with certain phonetic elements
leading to ambiguity, a person may want to be perfectly clear, so he may
stress the needed syllable as strong as he wants if it helps. So one can
stress the "oo" in "vyroo" much more than the first syllable which is in
fact the only one that can bear stress. Isn't it only a kind of "logical
stress"?

> - what type could this new stress be in the terms of LH:HL contours
> opposition: rasing intonation (circumflex), falling intonation (acute),
> something third?

If marked (and it shouldn't be), it would be rasing intonation just because
the last stressed syllable in Lithuanian is always said to have rasing
intonation. There are some unexplainable exceptions, eg the last syllable of
sg and pl dative case is always stressed and marked with an acute sign.
Maybe there is an explanation but, frankly, I think few things are more
inconsistent than Lithuanian phonetics. The whole language should be
rationally reformed and the process started in some fields.

Juozas Rimas