MP3 encoding of wav files from Olympus voice recorder

Hi there,

My Olympus Voice Recorder VN-960PC generates wav files, and I wonder why
I cannot mp3 encode them usine LAME. If I try to do so, I get mp3 files
that are inaudible, I mean, I can hear nothing else than a background
noise like compressed air leaking out of a cut tire. Using Lame, I can
successfully encode *.wav files coming from anywhere, but not those that
come out from my voice recorder. Could anyone explain me what the problem
could be and what to do about it ? How should I set lame parameters for
those particular wav files ? What other encoding program should I use ?
.

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