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I've been trying to modify the title screen song with another one, and for some reason when I tried verifying the changes the audio was very loud and distorted, I tried changing many settings in Audacity and the AtomEncoder tool to no avail, I even tried lowering the audio manually to cancel it out but that didn't work either.

I downloaded the audio using yt-dlp as .webm, lowered it with the 'Amplify' effect by '1.5dB' (I found someone suggest this to fix the issue for Sonic Adventure 2), then exported the .wav file as a "signed 16-bit PCM" file, then used SonicAudioTools and Aemulus to build the mod and moved it to the /data/p5r/, but each setting change I make either changes nothing, or results in muted audio.

I've searched all over the internet for solutions and saw a youtube video of P5R but even that didn't include any info about this issue, I think I'm being stupid and missing something here.

I found the solution! Turned out I had to encrypt the adx files before packing them back into the bgm.awb file, I added a segment in the BGM.awb wiki page for Persona 5 Royal.
I used VGAudioCli with the following command to fix my issue just for anyone looking for a quick solution: substitute the Keycode with the one specific for your game's region, you can find a list here.