I use the "fluted" to describe a clear whistle as opposed to buzzy like Blue-Winged Warbler or warbling like a Wren. If you've heard the Orioles sing you'll know what I mean.
As for your bird, I'm at a loss...I hope somebody else on the list can help you, Good Luck
Spem longam reseces. Dum loquimur, fugit invidia aetas. Carpe diem, quam minimum credula postero. - Horace