| br>Yes Powder
| br>With two R54s in series and a common CV source you can get something close to an S-2000, but it'll never sound or behave quite the same.
To get something resembling the S-1000, you'd want to run the R54s in parallel to the R53, and then R52—plus a VCA at the end. Once again, it will not sound or behave quite the same as an S-1000, especially because the S-1000 uses thyratron oscillators which are based on a completely different circuit topology than the R54.
Rather than trying to simply capture the sound of an unobtanium synth like the S-1000 though, play around with what you have. Two R54s, a 53, and a 52 should be a pretty good jumping point for plenty of new and different sounds, and probably more versatile than the S-1000 anyways.
On the other hand: if Eric ever decides to reissue the R55 again, I suggest buying two! br> br>