Cardinal patch of used parts of Solar 42F synth in the video : https://www.youtube.com/watch?v=wQyHPJ56aNg

With midi keyboard, use pads on channel 10 for the 4 drones, enable/disable the third oscillators and also phaser and delay effects, the channel 1 for the melody, 2 sliders for cut-off frequency and q of the lowpass filter.