Use the Link Tile modifiers. In the item data, the "Link Tile Mod" is what is added to the tile number of all the link tiles. For example, if the arwing tiles are 4 rows of tiles below the Fox tiles, then set the tile mod data for Misc 1 to 80, and the tile mod data for Misc 2 to -80. Give Fox the Misc 1 item during the transition to the space scene, then give him the Misc 2 item to change him back.

Make sure that the MIDI you want to play on the OW is set on the Dmap data.