The First "Fade" & The First "Live" Recording

I'm kind of a nut for historically interesting trivia regarding records, such as the first two-sided 78 or the first 12" (don't bother answering these - I already have the answers somewhere else). What I'd like to find out is: what record features the first use of an intentional "fade" at the ending; and what record was the first "live" recording (with audience audible) released? I had the answer to the latter question many years ago and somehow I lost the source. All I remember was that it was from the late 1920's or so.

Regarding "live" recordings: I had a feeling the earliest ones would be of opera and/or classical music. The one I remember was listed in a Big Band record price guide (the prices were obsolete when I bought it; now I just keep it around as a discography and release-date reference...if I can find the thing...).
Some years ago I recorded some jazz 78s for a local college radio station program and they got broadcast a week or two later. The DJ got all excited about hearing some "Jazz At Seymour's" records and on the air declared "These must be the earliest live recordings ever released". Well, I think he was off by at least 15 years.
Regarding "fades": no doubt it would be a product of the electrical recording era since I don't think they'd have the technology available to do a fade in the accoustic era. And I'm sure it would be a "Part One" / "Part Two" recording - one example I have is a 12" single of "Oh Baby" by Benny Goodman which fades on the first side, but even that's from 1946 (or so) and I'm certain there has to be an earlier example than that.

I think I remember reading SOMEWHERE, that Victor had the first mobile recording studio, that could record live performances, and that it was an opera that they first used it to record. I think it was about the same time, or shortly after Victor first introduced electrical recordings. I think it was in a small truck or van, and they had 2 of them. I only wish I could remember where I read it. I'm sure it mentioned the very first session it was used for, but am pretty sure it was an opera.

wand143 is on the right track: as far as I know it was Benny Goodman. But it was a quartet recording on Victor, meaning it was between some time in 1935 and 1939. If I run across it, I'll come back and name it. I don't think it's presently on my MP3 player....

FYI: I finally found that record guide I was looking for - the prices are long obsolete but it's a great source for years of release and such...I'm certain it mentions the first "live" Big Band recording...as soon as I dig through it I'll let you all know.