Hi Yuki,
I don't think we should trust the prounciations given in dictionaries too much. If you listen to some clips from the American Heritage Dictionary, you can hear that the speaker doesn't even tap the t's!!! (listen to "matter"). What kind of American weirdo is that? LOL
Anyway, I listened to your clip, and it seems to me that the first vowel is a little too "open" (I don't know how to say that), and the second is a little too "closed". That is a schwa sound, and it can vary a lot... I'm going to open a thread about the schwa in a few days, I'm interested in how much it can vary.