So is he playing both synth parts (i.e. the lower octave bouncy synth throughout the verses as well as the higher pulsing synth part during the chorus)?

Someowhere someone said that he played it with 2 fingers..... i could see him doing the high part like that (it's like 1 note at a time) but the other part that runs througout the song sounds like chords

I've been wondering this too

what is the miracle part he played that pulled this song out of the trash heap? I'm guessing the high melodic part