From the Jimmy Eat World discography, the description is as followed:

Release Date: Feb. 12, 2001
Label: Sunset Alliance
Credits/Info: Recorded/Mixed live by Jim Adkins at Modified/Livinghead Studios Dec. 1999.
Notes: 17 song compilation of Phoenix's favorite indie rock bands supporting the art space Modified.
Features debut release from Go Big Casino
(Jim's short lived side project which also brought you "Hear You Me" and "My Sundown" from 2001 Self-Titled Lp).

Track #6 is: So Proud of You

I was then given really good info about this version of So Proud of You. ..

Thank you SO much Justin Iacovino:
According to the Jimmy Eat World message board:

Fan: "I would really love a better recording of So proud of You. The only
one I have ever heard has really rude people talking and laughing all the
way through it. It's still awesome though."

Jim: "i did a home version once from that time era. i thought the live
version was better to put out because that was the recording of the first
GBC song i wrote, the first song we played at the first show. how many
chances do you get to relase something so immediate."

Also, GBC wrote Cautioners and When I Want(the unreleased Futures track).

and thank YOU Chris McGrath:
The track was recorded live at the December 1999 show at Modified Arts (an art/performance space in
downtown Phoenix). I recorded it and you can hear Jim mention my name during the show ("the man behind
the curtain") in the low-fi MP3s of the show (from the audience, I would assume).
Jim mixed the track after I moved away from Phonix in January 2000.