Sound recording from Poland (1 Viewer)

[JayFeatherPL]

North-eastern Poland, Biebrza National Park, 4th May, 11 am, it was at the big marsh, the weather was warm and sunny. There is sedge warbler singing, but another bird can be heared at 0:01, 0:04 and from 0:05 to 0:12. This short trill, is it sedge w
arbler too, or is it another bird?

 

[Butty]

I don't think it's good etiquette to bump a topic after it's gone only 1½ hrs without a response. Putting something more helpful in the topic title (including the country and the fact that it's a sound recording) might encourage replies.
[bump-post, above, since deleted]

 

[CARERY]

I only hear Sedge Warbler, performing many of it's song elements, Trush Nightingale (e.g. 0:13) and Coot