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It’s also good to read the manual words. See http://www.inovon.com/download/222%20Manual.pdf
Look on page 10 under the heading “Assymetrical Modulation”. It says it will PASS program material that is assymetrical and further, the 222 WILL NOT CREATE ASSYMETRY. This is a lot more honest than the typical 222 ads that lead you to believe it will create assymetry.
As others here have concluded, creating assymetry is difficult. Completely digital, DSP based processors could easily do it to any absurd extent with the proper algorithm programmed in. I think an analog version could do it by shifting the the level upward whenever the negative limit is touched. But, the hard part is getting the response time down to a fraction of a millisecond to properly follow the negative peaks at all audio frequencies up to 10kHz in real time.