I've Googled the "modified rapture" bit since answering. Here's the first copy of the full story I found: http://www.algss.org/GandS.aspx
"Another interesting change from what Gilbert originally wrote is Nanki-Poo's "Modified rapture" on learning that Yum-Yum is to marry Ko-Ko but doesn't love him. Gilbert originally wrote simply, "Rapture", but at a rehearsal felt that Durward Lely, as Nanki-Poo, was putting too much into the word, so called out "Modified Rapture". Lely, misunderstanding, repeated, "Modified Rapture", which so pleased Gilbert that the line remained thus."
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Date: 2007-08-30 06:07 am (UTC)"Another interesting change from what Gilbert originally wrote is Nanki-Poo's "Modified rapture" on learning that Yum-Yum is to marry Ko-Ko but doesn't love him. Gilbert originally wrote simply, "Rapture", but at a rehearsal felt that Durward Lely, as Nanki-Poo, was putting too much into the word, so called out "Modified Rapture". Lely, misunderstanding, repeated, "Modified Rapture", which so pleased Gilbert that the line remained thus."