What you describe here is the audio has been recorded with a DC offset which permanently moves the zero crossing up or down by a fixed offset value. EQ will not do this to our knowledge. I expect the source that you recorded from injected this offset and Microsound did not remove it.
How did you record the original file to the hard drive?
1. From a digital audio source using the digital (AES or SPDIF) input ports
2. From an analog audio source using the analog input channels
3. By ripping a tracak from an Audio CD
4. It was stored on a CDROM as a file that you opened and/or copied to the hard drive
This would help me identify the source of your DC offset problem.
BTW: EQ doesn't change a DC offset value.
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