MPEG2 Layer 1 do differ from MPEG1 only in its multichannel feature; audio encoding for a channels are same for MPEG1 and MPEG2.
ISO recommends to use psycho model 1 for both layer 1 & 2.
 
Regarding  Layer 3, this uses entirely different audio representation. You may have to read little more on this :).
Perhaps :-)
 
My only experience with Layer I was this wonderfull (at that time) portable DCC recorder.
While we are on this topic, may I ask you why are you interested in Layer I.
I am wondering about the use of this, as it seems to me that Layer II should not need much more computations.
 
Regards,
 
----
Gabriel Bouvigne
www.mp3-tech.org
personal page: http://gabriel.mp3-tech.org

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