diff --git a/Rom.py b/Rom.py
index 9f731053..af360e3d 100644
--- a/Rom.py
+++ b/Rom.py
@@ -824,8 +824,8 @@ def apply_rom_settings(rom, beep, quickswap, fastmenu, disable_music, sprite):
                     0xD2866, 0xD2887, 0xD28A0, 0xD28BA, 0xD28DB, 0xD28F4, 0xD293E, 0xD2BF3, 0xD2C1F, 0xD2C69, 0xD2CA1, 0xD2CC5, 0xD2D05,
                     0xD2D73, 0xD2DAF, 0xD2E3D, 0xD2F36, 0xD2F46, 0xD2F6F, 0xD2FCF, 0xD2FDF, 0xD302B, 0xD3086, 0xD3099, 0xD30A5, 0xD30CD,
                     0xD30F6, 0xD3154, 0xD3184, 0xD333A, 0xD33D9, 0xD349F, 0xD354A, 0xD35E5, 0xD3624, 0xD363C, 0xD3672, 0xD3691, 0xD36B4,
-                    0xD36C6, 0xD3724, 0xD3767, 0xD38CB, 0xD3B1D, 0xD3B2F, 0xD3B55, 0xD3B70, 0xD3B81, 0xD3BBF, 0xD3D34, 0xD3D55, 0xD3D6E,
-                    0xD3DC6, 0xD3E04, 0xD3E38, 0xD3F65, 0xD3FA6, 0xD404F, 0xD4087, 0xD417A, 0xD41A0, 0xD425C, 0xD4319, 0xD433C, 0xD43EF,
+                    0xD36C6, 0xD3724, 0xD3767, 0xD38CB, 0xD3B1D, 0xD3B2F, 0xD3B55, 0xD3B70, 0xD3B81, 0xD3BBF,
+                    0xD3F65, 0xD3FA6, 0xD404F, 0xD4087, 0xD417A, 0xD41A0, 0xD425C, 0xD4319, 0xD433C, 0xD43EF,
                     0xD440C, 0xD4452, 0xD4494, 0xD44B5, 0xD4512, 0xD45D1, 0xD45EF, 0xD4682, 0xD46C3, 0xD483C, 0xD4848, 0xD4855, 0xD4862,
                     0xD486F, 0xD487C, 0xD4A1C, 0xD4A3B, 0xD4A60, 0xD4B27, 0xD4C7A, 0xD4D12, 0xD4D81, 0xD4E90, 0xD4ED6, 0xD4EE2, 0xD5005,
                     0xD502E, 0xD503C, 0xD5081, 0xD51B1, 0xD51C7, 0xD51CF, 0xD51EF, 0xD520C, 0xD5214, 0xD5231, 0xD5257, 0xD526D, 0xD5275,
@@ -848,13 +848,22 @@ def apply_rom_settings(rom, beep, quickswap, fastmenu, disable_music, sprite):
                     0xD9544, 0xD95A8, 0xD9982, 0xD9B56, 0xDA694, 0xDA6AB, 0xDAE88, 0xDAEC8, 0xDAEE6, 0xDB1BF]),
             (0xE6, [0xD210A, 0xD22DC, 0xD2447, 0xD5A4D, 0xD5DDC, 0xDA251, 0xDA26C]),
             (0xF0, [0xD945E, 0xD967D, 0xD96C2, 0xD9C95, 0xD9EE6, 0xDA5C6]),
-            (0xFA, [0xD2047, 0xD24C2, 0xD24EC, 0xD25A4, 0xD3DAA, 0xD51A8, 0xD51E6, 0xD524E, 0xD529E, 0xD6045, 0xD81DE, 0xD821E, 0xD94AA,
+            (0xFA, [0xD2047, 0xD24C2, 0xD24EC, 0xD25A4, 0xD51A8, 0xD51E6, 0xD524E, 0xD529E, 0xD6045, 0xD81DE, 0xD821E, 0xD94AA,
                     0xD9A9E, 0xD9AE4, 0xDA289]),
             (0xFF, [0xD2085, 0xD21C5, 0xD5F28])
     ]
     for volume, addresses in music_volumes:
         for address in addresses:
             rom.write_byte(address, volume if not disable_music else 0x00)
+    
+    # restore Mirror sound effect volumes (for existing seeds that lack it)
+    rom.write_byte(0xD3E04, 0xC8)
+    rom.write_byte(0xD3DC6, 0xC8)
+    rom.write_byte(0xD3D6E, 0xC8)
+    rom.write_byte(0xD3D34, 0xC8)
+    rom.write_byte(0xD3D55, 0xC8)
+    rom.write_byte(0xD3E38, 0xC8)
+    rom.write_byte(0xD3DAA, 0xFA)
 
     # set heart beep rate
     rom.write_byte(0x180033, {'off': 0x00, 'half': 0x40, 'quarter': 0x80, 'normal': 0x20}[beep])