wiki/pages/_en-US/twilightmenu/custom-dsi-3ds-sfx.md

lang	layout	section	category	title	description
en-US	wiki	twilightmenu	customization	DSi/3DS Skins - Custom SFX	How to use custom background music and sound effects in DSi and 3DS skins for TWiLight Menu++

TWiLightMenu supports custom sound files in themes. Place your sound files under the sound subdirectory in your theme folder, for example for the white theme, you would place the files at themes/white/sound/sfx.bin and themes/sound/bgm.pcm.raw respectively. Both files are optional, if one is missing the default music will be used. You should then also set the music option in settings to "Theme".

These instructions assume you have devkitPro installed with mmutil. You can get devkitPro at the devkitPro website.

Sound Effect Bank

The sound effect bank contains sound effects such as the icon select sound, etc.

File	Description
startup.wav	Played on startup. See the section on Startup sound for more details
back.wav	Back
launch.wav	Played when launching a game
select.wav	Played when moving the select cursor
wrong.wav	Played when reaching the end of the page
switch.wav	Played when switching pages
stop.wav	Played on the DSi Theme when the select cursor stops moving
bgm.pcm.raw	Not part of the soundbank. See the section on Menu BGM for more details

You can then run make to make the sound effect bank. All files listed above, except bgm.pcm.raw are required, but you can make them silent.

Your resulting sfx.bin must be under 512000B = 512 kB. Any larger will result in either crashes or some sounds not playing fully.

Startup sound

While the other sound effects will work with any WAV file, the startup sound must be in a specific format in order to work properly, otherwise there will be a gap between when the startup sound stops and the background music begins.

The startup.wav file must be 16-bit 16 kHz. You can use Audacity for example to convert to this format. Once the file is loaded in Audacity, change the Project Rate (Hz) to 16000, then press Shift+M, and change the Format to 16-bit PCM.

If your file is in Stereo, you should also go to Tracks > Mix > Mix Stereo down to Mono.

You must set PlayStartupJingle=1 in your theme.ini for the startup jingle to play.

Menu BGM

Menu BGM needs to be a 16-bit 16 kHz Mono raw PCM file. Below are two methods for converting audio files into that format.

Unlike sfx.bin, bgm.pcm.raw can be arbitrarily large.

ffmpeg

The simplest way to convert music for use in TWiLight Menu++ is to run this ffmpeg command in a terminal:

ffmpeg -i [input file] -f s16le -acodec pcm_s16le -ac 1 -ar 16k bgm.pcm.raw

Replace [input file] with the name of the file you want to convert. You can usually do this by simply dragging the file onto the terminal window with the cursor in the correct location.

Audacity

If you don't want to use the command line you can also convert using Audacity.

To convert the audio:

1. Load the file in Audacity
2. If your file is in stereo, click on the song then select Tracks > Mix > Mix Stereo down to Mono
3. Change the Project Rate (Hz) in the bottom left to 16000

To export in the correct format:

1. Select File > Export > Export Audio...
2. Set File Type to Other uncompressed files
3. Set Header to RAW (header-less)
4. Set Encoding to Signed 16-bit PCM
5. Set the output name to bgm.pcm.raw and click Save
6. Click OK to the metadata editing

Now you have a bgm.pcm.raw file that can be copied to the sound subfolder in your theme folder.