Strange noise from my new mac pro

Bit of a silly question: my Macbook Pro keeps making these short 'whooshing' sounds, but I just can't figure where they're coming from, or why they're happening. I notice these when I have just my browser and/or iTunes running. It's from some software (i.e., not a fan noise). Any ideas?

Hello, thanks for the responses!
x4...: Haven't tried using another account; my computer has only one registered currently (it's spanking new)
I did try logging into safe mode - while I received no indication that it was on safe mode, all sound functions appeared to be terminated when I logged on after long-pressing Shift. Panicked in a small way there, ha ha.
Bart..: Quitting email clients (mail, gmail, outlook on web) didn't help
And nope - no one else logged into computer.
All this said, the sound has stopped mysteriously right now. There's a good chance it'll start again though (it's done this before, with no connection to newly opened programmes or anything)
Thanks, all!

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    Hello, thanks for the responses!
    x4...: Haven't tried using another account; my computer has only one registered currently (it's spanking new)
    I did try logging into safe mode - while I received no indication that it was on safe mode, all sound functions appeared to be terminated when I logged on after long-pressing Shift. Panicked in a small way there, ha ha.
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    Thanks, all!

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