That was nice, but the nastiest midi ever.

I'll be able to hear the Mp3 in a wee while, so I'm sure that will improve things.
Some nice harmony in this, and it built up a good sense of motion about half way through, although this was perhaps cut a little short - I'd have liked more of that, and maybe a build-up into something.
Those high Bs in the tpt are a total bitch to play at
piano and especially without being lead into - but you've got an Mp3, so I'll assume the players managed.

(Oh wait, I just read it's an EWQL Mp3 - never mind)
I think this slow bit works well, but it could become a lot more if it lead into, say, an Allegro section/movement. There's no reason not to write a full sized quartet - just let the players play this Adagio, but add more movements to make a full piece.
Good work - and what seems pretty playable work, so good job!
What were the players' comments?