It's worth noting most of the time, Emerson basically just used a Minimoog style voice. The main things he used on the modular that you wouldn't have on a stock Minimoog are the preset box, the ribbon controller (I know you could patch a ribbon controller into the Minimoog, but I'm not sure if it could be used the way Emerson used it), the custom sample and hold module (used on Karn Evil 9 First Impression Part Two and I believe also on some of the live versions of Tarkus), and the double sequencer (heard at the end of Karn Evil 9, it's the last sound on the album).
But I think he probably could have customized a Minimoog, to give him most of the features he used (actually, he'd not have to alter anything about the synth itself to get the sequencer and sample and hold functionality, he'd just run control signals from modules). But he would have still been stuck with a three octave keyboard versus the modular's five octaves.
The giant Moog he had later on, I think starting during the Trilogy tour (isn't that why the one tour was known as "Get me a ladder" tour, because of oversized the Moog had become?), was largely for show. I saw a video awhile back where they talked about the copy that Moog Music made a few years ago, and it was mentioned some of the modules are just panels with pots and jacks mounted on them, but they're not wired up to anything. They at one point talk about how he had a switch from fighter jet or whatever, ya know, one of the ones with the protective cover that you have to flip up before you throw the switch itself, which they said wasn't connected to anything, it was there for show. There's also a row of LED's, which likewise, didn't do anything, except flash on and off in random configurations.
As for the Apollo and Lyra prototypes, I believe those did indeed go back to Moog Music at some point. Either that, or there were at least two Apollo prototypes, as Erik Norlander performed in concert a couple years ago with a restored Apollo. But like I said, I'm not sure if it was Keith's or another one. Not sure of the whereabouts of the Lyra. Keith never used the Taurus because he liked playing bass lines on his Minimoog while Greg was playing guitar (did he use the Minimoog for anything other than basslines?)
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