Further, FYI: famitracker has a few different variants, with DN–famitracker being the fork, currently closest to accurately reproducing, the NES and the most common extant sound expansion chips: https://github.com/Dn-Programming-Core-Management/Dn-FamiTra...

And Famistudio is an excellent alternative if you prefer composing on a piano roll: https://famistudio.org