I have heard of Rebikov (I mention him in mthe biography of Henrique Oswald I wrote for the site.) He was the director of the Moscow Conservatoire for a time and was a friend of the Brazilian's, both having met on a train in Italy (if I do not err) and each of them wrote a piece apiece (
) dedicated to each other.
I have listened to your recordings, not with earphones, but with loudspeakers (to computer ones). You seem to have the same problems as I do with the recording apparatus and that you get hiss, which you have to filter out, or so it seems, as the result, very clear otherwise, seems to distort the soundwaves. I hear any sustained note as if it FlUuuUuUtTeErrEd, fi you get what I mean.
They are very short pieces, but not at all devoid of charm, finishing almost before one really gets into them! They establish a mood rather than give any clear musical statement, as they are too brief to give any definitive idea of form. Let us call it "intimate music"!