Microphone/Recording issue [Odd?]

Hello everyone,

So this has been an issue for me for awhile and so far nothing I've done has worked to fix my microphone at all.

So the issue is that If I sing a note for more then 3 seconds my audio changes sounds. Like I'll sing a note straight out for 4 seconds. The first 2 seconds sound fine but when it get's to the 3rd and 4th second of the note it sounds like I'm singing through a telephone.

I don't change my singing and I don't mess with my microphone at all in these 4 seconds but the quality changes.

It's not really a problem alot of the times but when I wish to sing ballads or if there's a long note in a song this always occures VVVVVVVVVVVVVVVVVVVVv

Audio Sample: http://www.box.net/shared/597c8fttdt

Info:
I use Audacity [newer version] to record
My microphone is a headset by Cyber Accoustics
It's not usb
I have Windows XP
uhhhhhhh nothing else really XD

ok so please help?

(I'm from brazil, hope you understand ''my english''! =P)

I got the same problem! And i know (i believe o.o) why this happen.
But i can't fix it, so, if someone know how to fix this problem please, tell us!

Ok, here whats happen:
In the Sound Configuration of the PC ( i think its appear side of your clock time) ''right-click'' him and you can configure it. You can see 3 option for ''upgrade'' your recording sound. There, you can find 2 option like ''Reduce echo'' ( don't know how it is in English's PC '-' ), and if you select these options, the problem that we have will come.

If i turn off the ''Reduce Echo'' options, i got echo in all my recording voice -_-

well, i use Windows Vista,
And to record i use Audacity ( already tried with differente programs and the sound problem still on)

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I know what your problem is XD
I used to get that same problem too! XD
It's something like noise removal thing but it's not really "reliable" in a way =w=
Anyway to remove that kind of thing go to:

Control panel>sounds>recording>microphone>enhancements> and disable all sound effects

Because when it's enabled those kind of things happen =3=
Anyway I hope this helps! Tell me of this doesn't ;w;