To be honest, I had never heard of Dutra either. It was serendipity. One day I got an email from a professional pianist with the pdf of the score attached suggesting that I might like to play the piece. I contacted one of our favorite Brazilian pianists here at PS, and he was equally in the dark in regards to Dutra. This is another of those cases where I had to develop a performance concept from scratch. This piece is a short work, but nonetheless I was really struck by the intensity of it!
I agree with you on the style. Had I gotten a Villa Lobos sound, for example, that would have been unsurprising. But yes, this was almost like late romantic Russian music. And I have no way to tell if it's characteristic of of Dutra's writing in general, or an exception. We can all pull out a piece by almost any composer and point to it as not being characteristic of a composer's usual style and idiom. But here we have no comparison pieces. I guess it just adds to the mystery of Dutra and his music.
On the reverberation, I believe it's the pedaling. In the higher tenor and up into the treble, one can often get away with more pedal up there. And in the bass, if the notes are well above forte, they can often override any preexisting overtones nicely. So sometimes it was intentional. But... yesterday I had done several takes, and it could be that my pedaling had become a bit lazy toward the end of the session, as this was the final take. Overall, I don't think it's too bad though.
Thanks for listening to this unknown work and your nice compliments. I appreciate it!