Some years ago, I started referencing Japanese games supporting MIDI in Hoot. The list is incomplete and obsolete (and lacking platforms), but maybe it can still help you.
Code:
o MT-32
[Arsys Soft] Star Cruiser 2
[Artdink] A-Ressha de Ikō 1
[Artdink] A-Ressha de Ikō 4
[Artdink] Eikan wa Kimi ni 3
[Artdink] Lunatic Dawn 2
[Artdink] Tenka Gomen
[Bothtec] Ginga Eiyū Densetsu 4
[Bothtec] Ginga Eiyū Densetsu 4 EX
[BPS] Frontier Universe
[Discovery] Mirage 2
[DO] Branmarker 2
[DO] Cry Sweeper
[DO] Crystal Rinal
[DO] Cyber Alpha
[DO] Hoshi no Suna Monogatari 3
[DO] Rouge no Densetsu
[DO] Yōjū Senki 2
[DO] Yū Disk 4
[DO] Yū Disk 6
[DO] Zatsuon Ryōiki
[DO] Zen Nihon Bishōjo Mahjong Senshuken Taikai
[Fuga System] Amaranth 2
[Fuga System] Amaranth 2 Music Disk
[Fuga System] Amaranth 3
[Fuga System] Dead Force
[Fuga System] Fuga Selection
[Fuga System] Marple Magic
[Fuga System] Oerstedia
[Gainax] Princess Maker 2
[Gainax] Fushigi no Umi no Nadia
[Giga] Steam Heart's
[Giga] Variable Geo 1
[Higashi] Hitomizaka
[Himeya Soft] Ash
[Himeya Soft] Bacta 2
[Himeya Soft] D'Ark Gaiden
[Hot-B] The Seven Colors
[Konami] Akuma Jō Dracula
[Konami] Deta na!! Twin Bee
[Konami] Gradius 2
[Konami] Parodius Da!
[Magical] Garō Densetsu 1
[Magical] Garō Densetsu 2
[Matrix] Solfleet
[Matrix] Tekkaman Blade
[Micro Cabin] Genei Toshi
[Natsume] Majoriko Inbikai Inbizone
[Parsley] Ponron Senshi
[Parsley] Quiz Bonnō Yobikō 2
[Parsley] Quiz Bonnō Yobikō 3
[PCM Complete] Gods
[Pegasus] Check Six 2
[Pegasus] Graystone Saga
[Silence] Cyber Arms Valkaizer
[Studio Twinkle] Bunretsu Shugoshin Twinkle Star
[Studio Twinkle] Kagami
[System Sacom] Gemini Wing
[System Sacom] Metal Sight
[System Sacom] Sanjūhachiman Kilo no Kokū
[System Sacom] Yami no Ketsuzoku 1
[System Sacom] Yami no Ketsuzoku 2
[Telenet] Yōgekitai
[TGL] Edge
[TGL] Farland Story 1
[TGL] Sword Dancer 1
[TGL] Sword Dancer Zōkango
[TGL] Sword Dancer Zōkango '93
[Wolf Team] Arcus 3
[Wolf Team] D
[Wolf Team] Diamond Players
[Wolf Team] Gō 1
[Wolf Team] Gō 2
[Wolf Team] Granada
[Wolf Team] Gulf War Sōkō Den
[Wolf Team] Hiō Den 1
[Wolf Team] Hiō Den 2
[Wolf Team] Hiō Den 2 Dash
[Wolf Team] Nikoniko
[Wolf Team] Ryū
[Wolf Team] Shinsengumi
[Wolf Team] Sol-Feace
[Wolf Team] Span of Dream
[Wolf Team] Suzaku
[Wolf Team] Tenbu
[Wolf Team] Tenbu Limited
[Wolf Team] Zan 1
[Wolf Team] Zan 2
[Wolf Team] Zan 3
[Zoom] Genocide 2
[Zoom] Phalanx
[ZyX] Gakuen Bakuretsu Tenkōsei!
[ZyX] Kaminari no Senshi Raidy 1
[ZyX] Kaminari no Senshi Raidy 2
[ZyX] Let's Pirates!
[ZyX] Ring Out!!
[ZyX] Takamizawa Kyōsuke Nekketsu!!
[ZyX] Trigger 2
[ZyX] Twilight Hotel
==========
o CM-64
[Active] Mahjong Fantasia 2
[BPS] Frontier Universe
[Giga] Steam Heart's
[Giga] Variable Geo 1
[Higashi] Hitomizaka
[Micro Cabin] Xák 3
[Studio Twinkle] Bunretsu Shugoshin Twinkle Star
[Studio Twinkle] Kagami
[System Sacom] Gemini Wing
[System Sacom] Yami no Ketsuzoku 1
[System Sacom] Yami no Ketsuzoku 2
[Telenet] Yōgekitai
[TGL] Sword Dancer 1
[TGL] Sword Dancer Zōkango
[Wolf Team] D
[Wolf Team] Diamond Players
[Wolf Team] Gō 2
[Wolf Team] Gulf War Sōkō Den
[Wolf Team] Hiō Den 1
[Wolf Team] Hiō Den 2
[Wolf Team] Hiō Den 2 Dash
[Wolf Team] Ryū
[Wolf Team] Shinsengumi
[Wolf Team] Sol-Feace
[Wolf Team] Span of Dream
[Wolf Team] Tenbu
[Wolf Team] Tenbu Limited
[Wolf Team] Zan 3
==========
o SC-55
[4x9] Angel Night
[4x9] Gaogao! 3
[4x9] Gaogao! 4
[4x9] Lilith
[4x9] Wakuwaku Mahjong Panic! 1
[4x9] Wakuwaku Mahjong Panic! 2
[Acid Plan] Charm 2
[Active] Mahjong Fantasia 2
[Active] Mahjong Fantasia 3
[AIL] Ruriiro no Yuki
[Alice Soft] Otome Senki
[Amusement Makers] Tōhō Fūmaroku
[Apple Pie] Russian Mahjong Harashō!
[Apricot] Nocturnal Illusion
[Arsys Soft] Star Cruiser 2
[Artdink] A-Ressha de Ikō 1
[Artdink] A-Ressha de Ikō 4
[Artdink] Eikan wa Kimi ni 3
[Artdink] How Many Robots 2
[Artdink] Kassen Sekigahara
[Artdink] Lunatic Dawn 1
[Artdink] Lunatic Dawn 2
[Artdink] Panzer Division 2
[Artdink] Rome Wasn't Built in One Day
[Artdink] Tenka Gomen
[Artdink] Tokio 1
[Artdink] Tokio 2
[ASCII] Giten Megami Tensei
[ASCII] Manhattan Requiem
[Aypio] Satyr
[Aypio] Sex 2
[Aypio] Sorcerer Kingdom
[Black Package] Ekdorado
[Black Package] Get!
[Black Package] Kara no Naka no Kotori
[Black Package] Miwaku no Chōsho
[Blucky] Rekiai
[Blucky] Street Mahjong 2
[Bonbee Bonbon] Nooch 3
[Bonbee Bonbon] Ribbon
[Bonbee Bonbon] Tamago Ryōri
[Bothtec] Ginga Eiyū Densetsu 4
[Bothtec] Ginga Eiyū Densetsu 4 EX
[BPS] Frontier Universe
[Breakthrough] Hellhound
[C-Class] Mahjong Sports Line
[C's ware] Amy to Yobanaide!
[Colossus] File:0
[Colossus] Liena Crystal
[Culotte] Oh! Kitsune-sama
[Custom] Metal Orange EX
[Desire] Saint Diary
[Desire] VR Date
[Desire] Yūgiri
[Discovery] Chakura
[Discovery] Marine Rouge
[Discovery] Mirage 1
[Discovery] Mirage 2
[Discovery] Red
[Discovery] Requiem for Fallen Angels
[Discovery] Sweet Emotion
[Discovery] Valkyrie
[DO] Branmarker 2
[DO] Cry Sweeper
[DO] Crystal Rinal
[DO] Cyber Alpha
[DO] Hoshi no Suna Monogatari 3
[DO] Rouge no Densetsu
[DO] Yōjū Senki 2
[DO] Yū Disk 4
[DO] Yū Disk 6
[DO] Zatsuon Ryōiki
[DO] Zen Nihon Bishōjo Mahjong Senshuken Taikai
[Exact] Étoile Princesse
[Fairy Dust] Akai Suishō no Hitomi
[Fairy Dust] Kōkan Nikki
[Fairy Dust] Lemon Angel
[Fairy Dust] Rall 3
[Fairy Dust] Ukiuki Island
[Falcom] Brandish VT
[Falcom] Eiyū Densetsu 4
[Family Soft] Area 88
[Family Soft] Asuka 120%
[Family Soft] Versnag Senran
[Frontier] Frontier
[Frontier] Rondo
[Fuga System] Amaranth 2
[Fuga System] Amaranth 2 Music Disk
[Fuga System] Amaranth 3
[Fuga System] Amaranth 4
[Fuga System] Amaranth KH
[Fuga System] Dead Force
[Fuga System] Oerstedia
[Gainax] Princess Maker 2
[Giga] Briganty
[Giga] Harlem Blade
[Giga] Steam Heart's
[Giga] Variable Geo 1
[Giga] Variable Geo 2
[Glodia] Alvarick Bōkenki
[Glodia] Bible Master 2
[Glodia] Different Realm
[Glodia] Etemible
[Glodia] Ragnarokkr
[Glodia] Zavas 2
[Hervest] Mu
[Hervest] Sela
[Hervest] Yūrō
[Higashi] Hitomizaka
[Himeya Soft] Ash
[Himeya Soft] Bacta 2
[Himeya Soft] De.Fana
[Himeya Soft] Nana Eiyū Monogatari 1
[Himeya Soft] Youthful Eager Stories!
[Himeya Soft] Youthful Eager Stories! HG
[Himeya Soft] Zenith
[Holy Wood] Vastness
[Humming Bird Soft] Paracelsus no Maken
[Janis] Bunny Hunter Ray
[Janis] Gakuen Triangle
[Janis] Kikai Jikake no Marian
[Janis] Kurumi-chan Ninja
[Janis] Princess Danger
[Kinpukurin] Faladia
[Kōgadō] Power DoLLS 1
[Kōgadō] Power DoLLS 2
[Kōgadō] Power DoLLS 2 Dash
[Kōgadō] Advanced Power DoLLS 2
[Konami] Akuma Jō Dracula
[Konami] Deta na!! Twin Bee
[Konami] Gradius 2
[KSK] First Queen 4
[KSS] Ryūki Denshō
[KSS] Star Striders
[Leaf] DR² Night Janki
[Leaf] Shizuku
[Leaf] Kizuato
[Leaf] Legam
[Leaf] Filsnown
[Libido] Libido 7
[Libido] Shinc
[LTT] Barcelona Fighter '92
[Maesta 7] The Knights 1
[Maesta 7] The Knights 2
[Magical] Garō Densetsu 1
[Magical] Garō Densetsu 2
[MeBio] Hyper Securities
[Micro Cabin] Xák 3
[Mischief] Merry Go Round
[Mugen] Horny Sweeper 1
[Mugen] Horny Sweeper 2
[Nihon Create] 3x3 Eyes
[Nihon Create] Diadrum
[Nihon Plantech] Ryōki no Ori 1
[Nihon Plantech] Ryōki no Ori 2
[Parsley] Farce
[Parsley] Image 1
[Parsley] Image 2
[Parsley] Mug-R
[Parsley] Panorama Club
[Parsley] Ponron Senshi
[Parsley] Re-No
[Parsley] True Love
[Parsley] Venus
[Pegasus Japan] Check Six 1
[Pegasus Japan] Check Six 2
[Pegasus Japan] Graystone Saga
[Pegasus Japan] Graystone Saga Gaiden
[Pegasus Japan] Round Warrior
[Right Stuff] Foresight Dolly
[Right Stuff] Rêverie
[Silence] Cyber Arms Valkyzer
[Sogna] Anime Mahjong X
[Sogna] Viper BTR
[Sogna] Viper CTR
[Sogna] Viper GTS-RS
[Sogna] Viper V6-RS
[Sogna] Viper V8-RS
[Sogna] Viper V10-RS
[Sogna] Viper V12
[Sogna] Viper V16
[Space Project] Clone Doll
[Space Project] Seiyoku Gakuen Serafita
[Studio B-Room] Hinadori no Saezuri
[Studio Mobius] Akumu
[Studio Twinkle] Bunretsu Shugoshin Twinkle Star
[Studio Twinkle] Kagami
[Studio Twinkle] Mime
[Sunsoft] Photogenic
[System Sacom] Michiyo Dreamy
[T2] Nozokiya Kagyō
[TGL] Appare Den
[TGL] Edge
[TGL] Farland Story 1
[TGL] Farland Story 2
[TGL] Farland Story 3
[TGL] Farland Story 4
[TGL] Farland Story 5
[TGL] Farland Story 6
[TGL] Farland Story 7
[TGL] Kisōshin Den Genkyzer
[TGL] Sword Dancer 1
[TGL] Sword Dancer 2
[TGL] Sword Dancer Zōkango
[TGL] Sword Dancer Zōkango '93
[Ucom] Bunkasai
[Ucom] Cherry Moderate
[U-Me Soft] Yumemizaka
[Wolfteam] The Grail Hunter
[Wolfteam] Tōkyō Twilight Busters
[Yamada] Angel Dive
[ZyX] Gakuen Bakuretsu Tenkōsei!
[ZyX] Kaminari no Senshi Raidy 1
[ZyX] Kaminari no Senshi Raidy 2
[ZyX] Let's Pirates!
[ZyX] Ring Out!!
[ZyX] Takamizawa Kyōsuke Nekketsu!!
[ZyX] Trigger 2
[ZyX] Twilight Hotel
==========
o SC-88
[Active] Mahjong Fantasia 3
[Black Package] Ekdorado
[Black Package] Get!
[Black Package] Kara no Naka no Kotori
[Black Package] Miwaku no Chōsho
[Discovery] Marine Rouge
[Discovery] Requiem for Fallen Angels
[Giga] Briganty
[Giga] Harlem Blade
[Giga] Steam Heart's
[Giga] Variable Geo 2
[Space Project] Seiyoku Gakuen Serafita
[Studio B-Room] Hinadori no Saezuri
[TGL] Sword Dancer 2