Background hissing sound in recordings sometimes there, sometimes not...

Hello all. I am trying to make some audio recordings with my macbook and with an external microphone. The quality is quite good, except sometimes there is a hissing sound in the background.
I make the recordings and then send them to itunes.
In some of the recordings there is no hissing sound. But then all of a sudden in the next recording I do a minute later, the hissing sound is back, out of nowhere, with no changes in the settings, no new sounds in the recording environment, or anything like that.
I've tried every possible combination of settings I can think of to get rid of the hissing sound, and the best setting seems to be using either "Podcasting" or "Vocals" with "no effects."
Does anyone know why this is happening, and what I could do to stop that?

Me too faces the same problem. It is not just the E90, but right from the Nokia 1600 upto the Nokia E90, none of the models have been spared by Nokia from this hissing sound. Check out my post at the below link.
/discussions/board/message?board.id=phones&message.id=20258#M20258

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Background hissing sound in recordings sometimes there, sometimes not...

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