<HTML><FONT FACE=arial,helvetica><FONT SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">IIRC, the "mixer" section of the 76477 was not an audio mixer, but a digital one. That is, the signals are combined using a logical AND function. This is the reason for the external multiplexing circuitry used in the Bullet kit, and for the external opamp tapping scheme used by Thomas Henry in his SuperController circuit.<BR>
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In short, I don't see that there's any real difference between the 76477 and the 76477N with regards to the "mixer" section.<BR>
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BTW, all the docs I've ever seen on the mixer make note of this logical AND technique, with appropriate caveats as to what it really means.<BR>
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Paul Camann</FONT></HTML>