Persona 4 Arena Ultimax: How to Fix Low Game Volume

You will need a hex editor, such as HxD or 010, and find your savedata.

Link to HxD (free): https://mh-nexus.de/en/hxd/
Link to 010 (paid, has free trial): https://www.sweetscape.com/010editor/

You can find your savedata by opening a windows explorer tab and pasting the following into the address bar, and then press enter;

%appdata%/P4U2/Save/

This will bring you to the folder where your savedata is located, the file you want to edit is called save.dat

Open your save.dat file in your Hex editor, you can do this by opening your hex editor and then dragging and dropping your save.dat file onto it.

And then go to the address 0x4C, highlighted below;

And now change this value to E8 03 00 00 (this is 1000 in little endian hex).

Now save your edit by either clicking save on the menu or using the ctrl+s keyboard shortcut, and you’re done!

You can confirm your edits by going ingame and checking the sound options and confirming that your Master Volume is now set to 1000 (although the fact that you can actually hear the game now should be confirmation enough).