^The Pittsburgh one seems likely to me:
http://radioguide.genesis-movement.o...html#x-13apr76
However, it isn't out of the question that radio recordings broadcast locally then are now forgotten/lost. One of my favourite examples of this relates to an Elvis recording made in 1956, just when he went national and became a superstar....it must have been broadcast on the radio at the time but I don't think this recording was known about until it turned up in the late 80s. This show now is part of the canon and has been released countless times.
http://www.elvis-collectors.com/elrocksl.html
I think Genesis have badly underused their live archive. This 1976/7 period in particular saw a lot of songs which they have not played since then and merit release.
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