How to create a "no music" patch for a 3ds game on Citra?

Hi,

I discovered a video on youtube of someone playing Majora’s Mask 3DS without the music thanks to a patch. I tried to find the patch in question on the internet but without success. So I think he created this patch himself and didn’t share it. I would like to do the same. For Wii games, there is simple software to modify the basic content of a game. Is there the same for 3DS? I thank you in advance for your help.

Kinds regards,
Antonin

Nobody knows how to do it? Here is the video in question: Zelda: Majora's Mask | East Clock Town | ASMR / Sleep aid | No music | Nintendo 3DS - YouTube

The author didn’t tell me how he made his patch but it’s not for asmr that I want it.