Moselle Software Synthesizer (free!): http://mosellesynth.com
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Buchla 700/Yamaha TX81Z comparison:    • Buchla 700/ID700 Configurations & Yam...  
Cherry Audio Sines implementation:    • FourOscillator FM Ring (Buchla 700 A...  
Supercollider implementation:    • Supercollider and the Buchla 700  

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Moselle patch:

[FMAlgo]
Freq1 = Pitch
Gain1 = BreathCtrl

Freq11 = 2*Pitch
Gain11 = CN3

Freq111 = 0.5*Pitch
Gain111 = FootCtrl

Freq1111 = 0.25*Pitch
Gain1111 = Balance
Plus1111 = Control1

[Voice]
PreGain = MakeBus( FMAlgo:PreGain1, FMAlgo:PreGain111)

[Osc]
Frequency = Pitch:Output * 0.25

[Scope]
SyncIn = Osc:SyncOut
Probe1 = FMAlgo:PreGain1
Probe2 = FMAlgo:PreGain111

0:00 Demo
0:48 Buchla's algorithm
3:01 FMAlgo block
5:32 Audio vs "Control" outputs
5:58 MakeBus for stereo output
6:41 Oscilloscope syncing
7:23 Resources to learn more