well the writeup on that site is obviously written by someone for whom english is a fourth language, so it's tough to tell exactly how it works. If you take the writeup literally, then it's responding to sound pressure - that is, it's measuring air pressure disturbances caused by the speakers when they vibrate. If that's the case then your left speaker is too far from its sensor.
I'm going to assume, however, that it really measures signal at the soundcard level, in which case it's not liking the signals your soundcard is sending.
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