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Fun VCOs? OK...the first one on my list is a double VCO that sortakinda can link the VCOs together in various ways. In a sense, it's the "poor man's Buchla 258": https://www.modulargrid.net/e/noise-reap-paradox

Another great complex-ish dual VCO, with its own onboard ring mod: https://www.modulargrid.net/e/void-modular-gravitational-waves

And then there's this, from Intellijel: https://www.modulargrid.net/e/intellijel-rubicon-ii

In all of these cases, the VCOs that are part of these modules have ways to crossmodulate, which in the end yields some rather complex spectra. With the right additional modules to get control of these, they'll yield some amazing textures and timbres.