The most artificial sounding sections in this synth music are those were chords and harmonies are just too perfect and blend together too much. This is caused m

The most artificial sounding sections in this synth music are those were chords and harmonies are just too perfect and blend together too much. This is caused mainly by two things: perfect tuning and perfect oscillator stability. If one were to mess with both (slight random base offset for each note, even slighter phase drift per note) one would probably get rid of that and generate a more impure, "warmer" sound. The convolution reverb works wonders on the synth output, though.