The AG-001 (or 001A or 001B) are IBM serial connection cables. The 'TO HOST' port allows you to directly interfact the Triton with your PC without using a sound card or other MIDI interface. The AG-002 cable is for Mac.

Both the AG-001 and AG-002 cables are optional. The AG-001A and B are cables custom made by a few different countries' Korg distributors, since the cables that Japan is selling are VERY expensive. These custom cables work in exactly the same way.

If you have a PC and are going to use your sound card to connect the two together (using the GAME/MIDI port), you don't need this cable.