Nero 5540-waveEdit

Hi Mates,
I'm usin' Nero5.5.4.0 with WaveEdit. the question is :
I open a MP3 file in "wave edit",then apply some effects(does'nt matter for my question) and the problem appears when I "save as" the file with .mp3 extension :
1-the bitrate is 64k instead of 128k
2-the sampling rate is 22khz instead of 44
3-that means poor quality sound!!!
4-don't understand why???
Does some one has an idea?
Thank's by advance to give a small attantion and reply(if 'u know).
ZiZouNet :)
 
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