You need a low pass filter over the microphone, use a piece of high density, well in fact experiment with all types of densities of "Foam" and place it in front of the Mic Hole and this will work well, Sometimes wool or fur, or anything that will absorb all the low frequency signals without reducing quality will work, thats why you see those "Socks" on the microphones in the movies. Another way, is to get a VOX switch, this start recording at the sound of your voice, and although fast will usually cut off the first syllable or so, or the first few Msecs of time when it starts this can be used to advantage in this case.
Conversely, some VOX's that are built in, can cause a noise at beginning of recording..
Sometimes the noise is the Motor noise, and it's picked up as a low frequency noise, this can happen in cheaper units, an earth a bit loose, bad connections, to name a few.
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The Edirol R-09HR has 2 internal mics situated on top of the unit and I place it on its stand when recording using the remote control to start the recording. I also use a Griffin 0404-LAP multipurpose stereo Lapel Mic with it, but get the shhhhing with that too - incidently, this continues throughout the recording not just at the beginning. Because I record in people's homes, shcools, sheltered housing it's difficult enough to get a decent recording without this extra interference, and I find I spend a great deal of time trying to minimise/eradicate these noises to the detriment of the audio. I'll certainly try out your suggestions. many thanks for your response.
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