There are so many options!
A few opamps hooked up together can be set up, roughly speaking, to have a voltage rise at a certain speed, and when it hits a certain point, the voltage descends. If you hook up such a...
That's not really how that works.
The grandmother and SE-02 are analog synths because they use discreet components and analog ICs to generate the waves, modulations, VCAs, filter signals, and mixing of signals....
One for audio (osc) out, the other for multiplexed CV control of external analog components. I didn't want to multiplex the osc out as I wanted to keep that at a high samplerate and free of potential noise.