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In case you wish to explore analog waveform generators...

Link describes the Sulzer oscillator, which maintains a constant amplitude over a range of frequencies. One potentiometer is sufficient to vary frequencies. The circuit is a variation on all-pass network.

allaboutcircuits.com/technical-articles/oscillator-circuit-never-heard-of-the-sulzer-network/

Simulation of the oscillator shows two or more nodes staggered 90 degrees from one another. Success probably requires a lot of adjusting.