With the random module we can sample & hold a signal from the input. Its companionship is the noise module. We feed the saw output to the input of the rand module.
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sine output → speaker right
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envelope output → sine key
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LFO square → envelope trig
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LFO square → sine fm
We can expand the setup by using the sequencer and utilize the filter. Because the nice thing about modular synthesizers is, that the filter can be used not only in signal paths but also in control paths ;-) .
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filter output → sine control
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sequencer output → filter input ---