The music would be easily changeable. Keep the older version, navigate to the music folder in both version
(mountblade warband\Modules\gekokujo\Music) and copy and paste the music from the old version into the music folder of the new version. The name of the music files will be the same because the game checks the name for the appropriate music to play in specific instances.
As for changes, there are buildable forts for temporary defence, agents/ninja to help open gates during attacks (from that, apparently castles have gates to block your entry now), ranged Ashigaru are now a mix of archers and gunners.
Version 3.0 Changes
General:
- All-new and more immersive music
- Rewrote the opening mission to be more morally ambigious, in order to set the tone (you'll see)
- Ranged ashigaru now spawn a ratio of gunners and archers rather than just one or the other. ranged samurai remain the same
- Your freelancer-assigned weapons are now taken away on defeat (your loot remains)
- Added a quest to return to your lord after freelancer army is defeated
- Added ability to request for promotion from ashigaru to samurai in freelancer with enough renown and relationship
- Added agents/ninja -- crude and limited for now (they only help you open castle walls)
- AI now form basic formations in battle -- not quite like other mods, but should be slightly improved over vanilla
- Added limited seafaring (sea routes are restricted) and new sea battle maps based on relative army sizes
- Added "forts" -- self-contained castles/hideouts with no income but free storage and recruitables
Scripting:
- Added the last of the 1.143 -> 1.153 fixes I missed
- Added the code that turned 1.153 -> 1.158
- Frequent lord_get_home_center errors are now fixed
- Added Zephilinox's mouse-controlled death camera
- Tweaked campaign AI to generate more aggression and war
- In addition to own tweaks, also added a few of motomataru's campaign tweaks
- Increased the reinforcement rate to handle the increased death rate
- Added forage skill (replaced block skill)
Miscellaneous:
- Rebalanced player enterprises
- Fixed typos EVERYWHERE (but they'll never go away)
- Changed text descriptions and word choices in order to sound less medieval European
- Constable is now Army Inspector, Chamberlain is now Treasurer, and Chancellor is Administrator
- Characters that were "(Name)-sensei" are now "Master (Name)"
- Doubled food unit amounts and consequently also the food weights
- Rebalanced lord reinforcements
- Samurai troops now cost 33% more in upkeep than Ashigaru
- Reduced loot spam (clothes, weak weapons)
- Retitled book names to have their in-game affected skill
- Changed the Kanazawa/Ikko start to Hirosaki/Nanbu (makes more sense considering new start quest)
- What were once called ronin troops are now called hirelings
- What were once called metsuke are now called ronin
- "Farmer" is now "Peasant Man" for symmetry with "Peasant Woman"
- Map icons are now slightly smaller to make the map look bigger
- Tournaments are now smaller affairs (2 teams of 4 maximum)
- Replaced Xerina, Dranton, and Kradus with several historical and fictional samurai in tournaments
- All loadouts are now possible in all tournaments
- Horses no longer spawn in practice arenas
- Revised trade goods slightly
- Fixed "vengeful" relationship at 90+
- Allows joining any side of an encountered battle
- Kiso horses are now only available to buy in Takeda lands
- Added placeholder Ainu clothes, armor, and weapons (thanks, Rathmor!)
- Party sizes are now: +30 base, +1 per 10 renown, +5 per Leadership, +1 per Charisma, +20 for faction leaders, +20 for faction strategists, and +10 per walled center (town/castle)
- Prisoner size bonus of +1 per 10 troops in your army (+5 per skill is untouched)
- Monk character background is now male-only (not historically accurate, just for balance)
- New Miko character background for female characters
- Fixed weapon and skill assignments for upper class women
- Character creation now grants firearms skills correctly
- Added ability to enable the cheat menu from the camp menu for laptop users
Factions:
- Imahama is renamed to Nagahama whenever Oda take it. Renamed back if Asakura take it. Everyone else keeps whatever name they took it over with
- Lord and Lady appearances are now defined rather than random
- So many more lords have their historical banners
- So many fief reassignments, holy hell
- Asakura clan now get half of the old Oda territory. Good luck, guys
- Daughters and unmarried sisters are now more common. Good luck, guys
- Changed lady names to either historical or period-appropriate names. I realized I did not want my own characters to marry a goddamn Touhou, I wanted them to marry Lady Kaede from Ran. Good luck, guys.
- Added Lord Kakizaki as a vassal of the Nanbu, who controls the only castle in Ezo (Hokkaido)
- Kaga Ikki are now called Ikko Ikki because they now have territories outside of Kaga
- Ikko Ikki monks are recruited from temple fortresses and Kanazawa, Ikko samurai volunteers from castles, and villagers from villages -- they now have the most varied troop tree
- Village recruits are now named after regions rather than clans, but all other troop names remain the same. This is to emphasize their initial loyalty to the land rather than their lord
- Oda and Tokugawa now start as formal allies. RIP everyone
- What was once the Urakami clan is now the Ukita clan. What the hell was I thinking
Geography:
- Much more detailed map, with so many new rivers, lakes, and islands. Less bland, I hope
- Added a few islands that can be reached via sea travel that have imporatant things on them
- Maybe someday I will add Korea near Tsushima (don't count on it)
- Several towns, castles, and villages have been renamed and moved around for better balance
- Some villages and castles are now also named after famous battle sites
- Added Ishiyama Honganji, Jogu-ji, and Nagashima as buddhist temple fortresses (for the Ikko)
- Added a pass to allow the Hojo and Uesugi to touch each other. Takeda should now die more slowly
Bandits:
- Bandit camps now spawn properly (whoops)
- Woku pirates now have guns rather than bows. RIP
- Greatly increased bandit activity in general. RIP
- Some bandit activity is based around the forts (see above). They will stop temporarily if you burn them down or permanently if you conquer them.
- Most of the bandit types have been renamed and re-equipped
- Bandit locations have changed as well
Companions:
- Adjusted personalities of companions for when they become lords
- Renamed certain companions to be less obnoxious about videogame references
- Changed their backgrounds as well. Sorry, sorry
- New option to remove the *consequences* of companion interactions with each other (Camp -> Gekokujo-Specific Options -> Disable ). They still bicker and whine to you about it, however.
- Changed the name and backstory of some pretenders
- The faction name now changes when certain pretenders win (Tokugawa -> Imagawa for example)
Weapons:
- New swords, spears, blunt weapons, knives, bows, and so on (just look at shop inventories!)
- There are now 6 tiers of bows and 5 tiers of guns
- Gunshot sound variety and improved gunshot sounds
- Better gunsmoke
- Added an anime sword, because I can
- Added shurikens
Armor:
- Improved kasa textures and added faction jingasa
- Jingasa now come in 3 shapes
- Added egawa trim to high class armors
- Changed the strap of the hara-ate armor to be less conspicuous
- Changed the underclothes of the low class armors to be less ugly
- Added a few new chest armor types (including nanban and yukinoshita) and a looot of new helmets
- Tekko now come in multiple colors and the tiers make more sense
- Jinbaori are now separate from armor and can be combined with anything you want (looks weird on clothes)
Clothing:
- Improved hakama models and improved textures overall
- Added proper kimono sleeves to everything
- More pattern variety to women's clothing
- Added tabi-only footwear for indoor use (the NPCs switch to them automatically)
- New monk and agent headwraps
Graphics:
- Changed launcher pic to one created by Rosslington
- Female player characters now have a more appropriate infantry icon on the world map
- Added 3 new Asian faces
- Modified female armor morphs to be more bulky
- Mostly new male and female hairs
- New arena scene!
- New prison scene!
- New mansion raid scene
- New town scenes with new architectural styles
- New temple scenes and props
- Sashimono are now polearms that you can't wield (add them to any armor!)
- Sashimono have 5 different shapes and sizes
- New default crests for heraldic sashimono
- Factions have their own ashigaru and samurai sashimono (officers have heraldic sashimono)
- Loading screens are now minimalist (only one figure rather than three)
Known Bugs
- Heraldic sashimono sometimes do not trigger properly (solid color)
- Certain lords with custom jinbaori do not have indoor clothing (and are thus naked)
- There are still one or two references to medieval europe in the dialogue that were missed
- A couple of the arrow flight meshes are oversized
(These aren't the only known bugs, these are the only known bugs that consistently happen)