Some of those sounds are not FM samples... they're actual frequency modulation (of course, using samples as the modulators themselves as well, kind of like what the Famicom Disk System's sound system used... only with BRR samples at any length)!
Fucking insanely guud. That arp melody that starts at 1:16 and the rockin progression that follows were fantastic. And when the lead joins in at around 3:57-4:24, lovely. I enjoyed this, thoroughly.
This song was originally made in January 2014 for Weekly Treats if I had won through ucollective. The song was lying abandoned for three and a quarter of a year before I decided to use it as a SPC Echoes 2 entry, since I realized the song qualified.