My Prosessor is a AMD Athlon (tm) II X4 630 Processor 280 GHz

My Memory installed (RAM) is 4.00 Go

My System Type is 32 bits
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I just finish a test.
I made a wave file of a song that I have ditortion in BBW 2011 and RealBand 2011.
When I play the wave file there's no distortion at all.
I ear the distortion only when the song is play in BBW 2011 or RealBand 2011.
So what could be the problem.