Everything except drums is made with the synth FM4. The project was more about learning FM synthesis than anything else. The heavy guitar sounding riffing playing thoughout is also FM4 just played through an amp distortion plugin.
Before buying this synth (FM4), FM synthesis was a complete mystery to me. I had tried a couple of FM synths before but they always left me very confused. FM4 was the first one I actually thought was somewhat intuitive to work with.