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Vintage analog monosynths
A monosynth plays one note at a time, and it's behind most of the classic bass and lead lines you know. Moog's Minimoog set the template in 1970. Some synths here stretch the rule. A duophonic synth can play two pitches at once, like Oberheim's Two Voice, which pairs two complete SEM modules under one keyboard. A paraphonic synth plays several notes through one shared filter and amplifier, so every note in a chord swells and fades together. Korg's Mono/Poly works that way with its four oscillators. Moog's Taurus I bass pedals, built from 1975 to 1981, belong here too. They're a monophonic synth you play with your feet on 13 pedals. The 1981 Taurus II redesign and the 2010 Taurus III are different instruments, so check which one a listing really is.
13 models

Roland · Analog monosynth
Roland TB-303
1981–1984 · Monophonic
Asking $3,825–$4,525 on eBay

Roland · Analog monosynth
Roland SH-101
1982–1986 · Monophonic
Asking $1,475–$2,100 on eBay

Moog · Analog monosynth
Moog Minimoog Model D
1970–1981 · Monophonic
Asking $9,225–$12,400 on eBay

Moog · Analog monosynth
Moog Source
1981–1985 · Monophonic
Asking $2,050–$2,425 on eBay

Moog · Analog monosynth
Moog Prodigy
1979–1984 · Monophonic
Asking $1,400–$1,600 on eBay

Moog · Analog monosynth
Moog Rogue
Monophonic
Asking $1,500–$1,525 on eBay
Moog · Analog monosynth
Moog Taurus I
1975–1981 · Monophonic

Korg · Analog monosynth
Korg MS-20
1978–1983 · Monophonic
Asking $1,975–$2,450 on eBay

Korg · Analog monosynth
Korg Mono/Poly
Paraphonic (4 voices)
Asking $2,000–$2,525 on eBay
Oberheim · Analog monosynth
Oberheim Two Voice
1975–1979 · Duophonic (2 voices)

Sequential Circuits · Analog monosynth
Sequential Pro-One
1981–1984 · Monophonic
Asking $2,275–$2,925 on eBay

Yamaha · Analog monosynth
Yamaha CS-30
1977–1980 · Monophonic
Asking $2,850–$3,200 on eBay

Yamaha · Analog monosynth
Yamaha CS-15
Monophonic
Asking $1,325–$1,650 on eBay