Weird sound when bounce to mp3

Hi,
When I bounce my tunes to mp3 I get this weird almost like a flanger effect over the whole track. I am sure I am doing something wrong but am not sure what. Could someone please give me some suggestions to remedy this.
Thanks.

Bounce in aiff to see if the problem persists; if not the import the file into iTunes and use it to convert to mp3.
If you obtain the same result in aiff too then you could have some phase coherence problem and you should have a closer looks to every single track to check with different eq or efx settings.
Remember that 2 sounds with the same frequency but with opposite phase erase themselves completely.
cheers
rob

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Id appreciate any comments regarding this..
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I have a yamaha DGX 300. It has a gorgeous sound that I want to capture (much better than that available on the iMac instruments). I have connected the keyboard to my iMac and have been able to record midi on logic pro ( can also use it to drive the internal logic instrumnets. When I play the midi back the sound comes out of my keyboard. In other words logic pro is driving my keyboard presumably by using the sound card in the keyboard. What I want is to be able to capture that sound in logic pro so when I bounce the track the yamaha sound is captured and I can record it.
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