FSX/FS2004 – Rockwell Aero Commander 680/520 HD-Audio flight2000it 8 years ago FSX/FS2004 – Rockwell Aero Commander 680/520 HD-Audio. Contains all the usual bells and whistles, plus installer. For the Milton Shupe models. Freeware By Skysong Soundworks 49 MB FSX – Aero Commander 520 Paint KitFSX – Aero Commander 520-78 N4172BFSX/FS2004 – Collins CTL22 COM1/2 And CTL32 NAV1/2