I experimented with the triple oscillator patch on the MS20 again. The external signal processor in the lower part of the patchbay can self-resonate when you patch its output back into its input, which gives you a third oscillator. I routed the output through the VCA in the patchbay and then into the HPF secondary input. The rest is just a quick impro with Strymon Volante adding delay and spring reverb on top.