Latency is the round trip time it take for sound to travel thru the system from the sound card/interface into the software, and back to the sound card/interface to exit to the ears. MME drivers do not have the speed compensation for this that ASIO drivers do. One thing to remember when PG product say MME they actually use the updated WDM drivers which are faster than the older MME, but still do not compensate like ASIO does.

ASIO4All on the other hand wraps the WDM drivers and makes them function very much like ASIO.

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