DSO never had Brent's B3.
Scott Larned bought Brent's Yamaha GS-1 FM synth from the 83-86 era off Brent's widow not long before he (Larned) died. That's the keyboard that replaced the CP-70 electric grand in 82 (which in turn replaced the Rhodes). It's most familiar and distinctive sound is the marimba-xylophone-wooden-mallet-like piano patch you hear on Tons of Steel (and lots of other tunes from that era). It also had a patch that was sort of a cross between a piano and a harpsichord he would use on softer tunes where the marimba-type sound would have been intrusive. It was a big heavy wooden beast of a keyboard. It cost about $25k new then, weighed 200 pounds and was the precursor to the FM synths like the DX-7.
Here's a (double) photo of it with Brent.
Scott played it on a few DSO shows before he passed away. No idea what became of it from then.
I have pretty strong feelings about the other issues raised here.
Having seen numerous Dead shows starting in 1978, 93-95 was pretty much a total loss to my ears, both what I've heard on the tapes and what I witnessed in person. The FOH sound was bad after Healy was gone. Jerry's tone was bad after the amps were gone. The high vocal harmonies were bad after Brent was gone. The scene itself had become larger and uglier. But those are my ears.
Sure, some shows were decent, stuff was happening, and Jerry could rise above all those things and make some magic happen in spots, but those spots were few and far between come 1995. By that point, it seemed like Jerry would check in for a few songs, and be nodding off the rest of the time. My last show was 4-7-95 in Tampa, and despite a nice reading of Visions of Johanna in the first set, a decent Loose Lucy and a pretty good Eyes to open the second set, he was largely absent the rest of the show, with some spots of playing (Samba in the Rain and Unbroken Chain) where he just sounded completely lost and was clamming all over the place.
I also agree heavily with Dozin, the MIDI stuff, and Garcia's in particular, did nothing for me. An interminable Row Jimmy from 1990 with that lame flute-like Korg M1 patch would have been 1000 times better with just clean, perfect sparkling Garcia guitar tone, a little slide, a little straight guitar. Give me Jerry's Tiger tone, Weir's early 80s tone (over that abrasive tone he copped later) with a good old organic Brent Rhodes or CP70 and B3, Phil's bass and the straight acoustic drums and let it rock. That was the pinnacle sonically to me -- at least in terms of what I witnessed live. Then, because everyone's sound was stable and in one fixed pallete, it was all about the playing and the reading of the tunes night to night, not the effects and the MIDI and Octobans and Roto-toms and the sampled drums. It seemed like they had become bored and then got swept up in the technology, which wasn't so great at that point anyway.
PIck any show from 1973 and why is it interesting and endlessly inventive? Because Jerry played a simple Strat-type guitar into a Twin with only a wah pedal for the really spacey jams, Weir played an ES-335, Keith played a real piano, Phil played a bass and Billy played a kick, three toms and a snare. All the innovation, all the magic, everything came from the players, not the toys.
(And letting Bralove monkey around with Welnick's tone from the side of the stage was ridiculous. The organ tone sucked, the synth tones sounded cheesy against Hornsby's Yamaha piano -- like a calliope. At least in 95, as weak as a lot of the shows were, Vince was back to a more or less straight piano sound, and he was really driving the band and keeping it together when Jerry was checked out.)
The whole decline was just a tragedy to watch, especially for those of us who saw the real magic happening in the 70s and 80s (and 1990).