Less intrusive approach using codecave.
Instead of overwriting half the original function, we just replace the calls to GetCategoryVolume with calls to our hooking functions located in a codecave (thank god what an awesome feature). Also makes it easier to maintain this patch and gives us volume control for each category independently.
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[XCXRebalanceAudioV101U]
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moduleMatches = 0xAB97DE6B
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codeCaveSize = 0x200
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_normalAudio = 0x028933EC
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_louderAudio = 0x028933F0
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_GetCategoryIndex = 0x030F201C
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_AfterEverythingIsDone = 0x28933F8
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##
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# You may change these floats
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##
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0x02893350 = bl _GetCategoryIndex
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0x02893354 = stw r3, 0x1240(r29)
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0x02893358 = lwz r3, 0x101A0004@l(r27)
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0x0289335C = bl _GetCategoryIndex
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0x02893360 = stw r3, 0x1248(r29)
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0x02893364 = lwz r3, 0x101A0008@l(r27)
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0x02893368 = bl _GetCategoryIndex
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0x0289336C = stw r3, 0x1250(r29)
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0x02893370 = lwz r3, 0x101A000C@l(r27)
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0x02893374 = bl _GetCategoryIndex
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0x02893378 = stw r3, 0x1258(r29)
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0x0289337C = lwz r3, 0x101A0010@l(r27)
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0x02893380 = bl _GetCategoryIndex
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0x02893384 = stw r3, 0x1260(r29)
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0x02893388 = lwz r3, 0x101A0014@l(r27)
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0x0289338C = bl _GetCategoryIndex
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0x02893390 = stw r3, 0x1268(r29)
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0x02893394 = lwz r3, 0x101A0018@l(r27)
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0x02893398 = bl _GetCategoryIndex
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0x0289339C = stw r3, 0x1270(r29)
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0x028933A0 = lwz r3, 0x101A001C@l(r27)
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0x028933A4 = bl _GetCategoryIndex
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0x028933A8 = stw r3, 0x1278(r29)
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0x028933AC = lis r11, _normalAudio@ha
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0x028933B0 = lfs f1, _normalAudio@l(r11)
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0x028933B4 = stfs f1, 0x1244(r29) #BGM
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0x028933B8 = stfs f1, 0x1254(r29) #BATTLE
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0x028933BC = stfs f1, 0x125C(r29) #FIELD
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0x028933C0 = stfs f1, 0x1264(r29) #GIMMICK
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0x028933C4 = stfs f1, 0x126C(r29) #SYSTEM
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0x028933C8 = lis r11, _louderAudio@ha
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0x028933CC = lfs f1, _louderAudio@l(r11)
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0x028933D0 = stfs f1, 0x1274(r29) #ENVIRONMENT
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0x028933D4 = stfs f1, 0x127C(r29) #WEATHER
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0x028933D8 = stfs f1, 0x124C(r29) #VOICE
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0x028933DC = li r28, 3
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0x028933E0 = li r30, 0x20
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0x028933E4 = addi r31, r31, -8
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0x028933E8 = b _AfterEverythingIsDone
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0x028933EC = .float 0.7
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0x028933F0 = .float 1.0
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0x028933F4 = nop
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0x000001A0 = .float 0.7 ; BGM
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0x000001A4 = .float 1.0 ; VOICE
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0x000001A8 = .float 0.7 ; BATTLE
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0x000001AC = .float 0.7 ; FIELD
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0x000001B0 = .float 0.7 ; GIMMICK
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0x000001B4 = .float 0.7 ; SYSTEM
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0x000001B8 = .float 1.0 ; ENVIRONMENT
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0x000001BC = .float 1.0 ; WEATHER
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##
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# Do not touch anything below if you don't know what you are doing!
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##
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# Labels for individual volume floats
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_audioVolumeDefault = 0x1006CF30 ; Also used by the fallback branch of setupCategory
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_audioVolumeBgm = 0x000001A0
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_audioVolumeVoice = 0x000001A4
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_audioVolumeBattle = 0x000001A8
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_audioVolumeField = 0x000001AC
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_audioVolumeGimmick = 0x000001B0
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_audioVolumeSystem = 0x000001B4
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_audioVolumeEnvironment = 0x000001B8
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_audioVolumeWeather = 0x000001BC
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##
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# Hook routines start here
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##
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# Override BGM volume
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_hookSetBgmVolume = 0x00000000
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0x00000000 = lis r11, _audioVolumeBgm@ha
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0x00000004 = lfs f1, _audioVolumeBgm@l(r11)
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0x00000008 = blr
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0x02893358 = bla _hookSetBgmVolume ; Install Hook
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# Override Voice volume
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_hookSetVoiceVolume = 0x00000010
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0x00000010 = lis r11, _audioVolumeVoice@ha
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0x00000014 = lfs f1, _audioVolumeVoice@l(r11)
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0x00000018 = blr
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0x0289336C = bla _hookSetVoiceVolume ; Install Hook
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# Override Battle volume
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_hookSetBattleVolume = 0x00000020
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0x00000020 = lis r11, _audioVolumeBattle@ha
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0x00000024 = lfs f1, _audioVolumeBattle@l(r11)
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0x00000028 = blr
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0x02893380 = bla _hookSetBattleVolume ; Install Hook
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# Override Field volume
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_hookSetFieldVolume = 0x00000030
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0x00000030 = lis r11, _audioVolumeField@ha
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0x00000034 = lfs f1, _audioVolumeField@l(r11)
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0x00000038 = blr
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0x02893394 = bla _hookSetFieldVolume ; Install Hook
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# Override Gimmick volume
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_hookSetGimmickVolume = 0x00000040
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0x00000040 = lis r11, _audioVolumeGimmick@ha
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0x00000044 = lfs f1, _audioVolumeGimmick@l(r11)
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0x00000048 = blr
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0x028933A8 = bla _hookSetGimmickVolume ; Install Hook
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# Override System volume
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_hookSetSystemVolume = 0x00000050
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0x00000050 = lis r11, _audioVolumeSystem@ha
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0x00000054 = lfs f1, _audioVolumeSystem@l(r11)
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0x00000058 = blr
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0x028933BC = bla _hookSetSystemVolume ; Install Hook
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# Override Environment volume
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_hookSetEnvironmentVolume = 0x00000060
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0x00000060 = lis r11, _audioVolumeEnvironment@ha
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0x00000064 = lfs f1, _audioVolumeEnvironment@l(r11)
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0x00000068 = blr
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0x028933D0 = bla _hookSetEnvironmentVolume ; Install Hook
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# Override Weather volume
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_hookSetWeatherVolume = 0x00000070
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0x00000070 = lis r11, _audioVolumeWeather@ha
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0x00000074 = lfs f1, _audioVolumeWeather@l(r11)
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0x00000078 = blr
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0x028933E4 = bla _hookSetWeatherVolume ; Install Hook
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