ive owned a bunch of filters for the jerry thing, old and new, including all the "go to's". you may not believe me, but the flamma filter is a killer pedal for $25 on amazon. mini size too. it's not a perfect jerry, but it's pretty great, easy to dial in and contrtol. doesn't do reverse sweep tho.
lots of good points here, and solid explanations.
i'll just add one thing...as a jerry fan:
this kind of thing is pretty common in the dead catalog and garcia's songwriting. the intro as it's own little vamp. it's also the coda/outro of the tune, and served as a segue into other songs when...