All Things Event Hacking

Actually, the latest beta of FF3usME has a feature that lets you assign which background is pulled up during Mog's Dances.

However, to change which backgrounds actually -teach- the Dancesets, you need to do hex-editing. MasterZED actually sent me a list already which details where on the rom one would need to change the values for each background to assign which Danceset is learned by having Mog fight on that background.

Address | BG# | Description | Danceset taught
002D905B 00: Grass 0
002D905C 01: Brown Forest 1
002D905D 02: Desert 2
002D905E 03: Green Forest 1
002D905F 04: Building 3
002D9060 05: World of Ruin 0
002D9061 06: The Veldt 0
002D9062 07: Falling through the Clouds 0
002D9063 08: Dark Town 3
002D9064 09: Grey Cave 6
002D9065 0A: Brown Cave 6
002D9066 0B: Mountain Top 4
002D9067 0C: Mountain Cave 6
002D9068 0D: Raft on a River 5
002D9069 0E: Imperial Base 2
002D906A 0F: On Top of Train Car 1
002D906B 10: Inside of Train Car 3
002D906C 11: Blue/Purple Cave 6
002D906D 12: Icy Field 7
002D906E 13: Bright Town 3
002D906F 14: Factory 3
002D9070 15: Floating Island 4
002D9071 16: Kefka's Domain 4
002D9072 17: Opera Stage 3
002D9073 18: Opera House Rafters 3
002D9074 19: Flaming House 3
002D9075 1A: Castle 3
002D9076 1B: Magitek Research Facility w/ Tubes 3
002D9077 1C: Colloseum 0
002D9078 1D: Magitek Research Facility 3
002D9079 1E: Village 0
002D907A 1F: Waterfall 5
002D907B 20: Owzer's House 3
002D907C 21: Running on Train Tracks 1
002D907D 22: Bridge near Sealed Gate 6
002D907E 23: Underwater 5
002D907F 24: Zozo 3
002D9080 25: Airship, WoB, centered 0
002D9081 26: Tomb 6
002D9082 27: Doma 6
002D9083 28: Kefka's Domain 6
002D9084 29: Airship, WoR, right 0
002D9085 2A: Red Cave 6
002D9086 2B: Light Building 3
002D9087 2C: Riding Car out of MagResFac 6
002D9088 2D: Fanatics' Tower 3
002D9089 2E: Cyan's Dream World 3
002D908A 2F: Desert 2
002D908B 30: Airship, WoB, right 0
002D908C 31: -- 0
002D908D 32: -- 6
002D908E 33: Statue 1 6
002D908F 34: Statue 2 6
002D9090 35: Statue 3 6
002D9091 36: Kefka's Background 0
002D9092 37: Tentacles 3
002D9093 3F: Narshe 6
002D9094 6
002D9095 6
002D9096 6
002D9097 6
002D9098 6
002D9099 6
002D909A 6

0 Wind Song
1 Forest Suite
2 Desert Aria
3 Love Sonata
4 Earth Blues
5 Water Rondo
6 Dusk Requiem
7 Snowman Jazz