I love all of the melodies!
I like this one. :) I like the melody a lot, and there are some nice musical devices you've incorperated in there.
Just as a note, I think there clarity could use just a little work, mainly in the lower tones, but I assume you are not yet completely familiar with mastering the Garritan? Either way, it's not that big of a deal.
Anywho, as I said, I like some of the melodies a lot. I don't know a lot about the study of counterpoint, but I think that you nicely created some counter-melodies throughout. The very highest melody in the treble cleff toward the beginning was one I liked quite a bit.
Out of the entire piece, I think the bass line could use the most work. It's not bad, but it, again, is a little muffled, and I feel was the melody lacking most. Not to say the melody wasn't good, I just didn't like it as much as the other counter-melodies in places. Also, try to maybe cut down on the pedal or something, because the bass does sound a bit over-pedaled or muffled in places.
I did really like this etude though, mainly for the many different melodies going on at once. It wasn't too much to follow, though there was plenty to listen to the song various times and follow the different lines. That made this most enjoyable, in my opinion. There were some small instances were there was some clashing notes, but I'm just being picky by saying this, because it really wasn't all that noticable.
So basically, my suggestions are to: Cut down on pedal use if possible, work on remastering, (mainly in the bass) and I'd also suggest trying to work just a little more on dynamics. Sometimes I felt one melodic line should have been brought out more clearly than the others, and that some should have been a bit quieter.
Really nice job though, I enjoyed this one a lot! 9/10 :D