Great app, but I dont like the sound effect when the window disappears

I think this is a really good app, small, smart, fast, beautiful. However, I have a suggestion that the sound effect when the window disappears is really annoying. I dont think that is necessary. Here is the reason: there are only two chances we can hear this disappear ”pu~”. One is when I play my radio, under this circumanstance, this “pu~” is actually a noise for me to hear my news. Second chance is when I stop my radio, when I stop my radio, i mean: please quiet! and this time, this so-called sound effect is kind of annoying too. So, please remove this “pu~” sound effect, I dont need it.

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