Thanks Steve-I remembered to contact Aardvark just after posting here-nice guys to! It is recommended on their(Aaardvark)website to only use ASIO-but I can't get Logic to boot so I can access Audio2 settings(unless maybe I disable MME??).However having said all this the Aardvark worked great on my P3-550 under MME-- Thanks. John Findlay http://www.mp3.com/JF-Instrumental