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Crosstalk between input and output of a SBPC128 soundcard ?

Hi all,
When I activate the baseband graph , the spectrum on  the low-end range  of  the waterfall graph is is affected in the following way:
In the range between 0 and about 500  Hz the noise level of the waterfall graph raises significantly and displays a 1/F pattern.
This fenomenon is aggravated when the volume-control of the baseband graph is set to a higher level.
I suspect cross-talk between the input and the output channel of my Soundblaster PC128 card.
Has anyone experienced a similar behaviour on his configuration with perhaps an other type of soundcard?
I there another  way to  disable the output of the baseband graph than setting the ouput-volume to minimum?
Thanks fo the feedback.