・How to make Custom theme（build to pkg
・How to make Custom theme（Sound effect）
・How to make Custom theme（Background Images and Icon Images ）
Place a file with the following name in the following theme directory structure.sound/bgm_home.at9
In addition, it is possible to specify the presence/absence of BGM playback by entering a "True" or "False" string in the <homebgm-enable> element in the theme XML file. When omitted, BGM playback will be enabled.
When BGM playback is enabled without the above file existing, the system default BGM will be used.
Sampling rate: 48 kHz
Number of channels: 2ch (144/240/288 kbps) or 5.1ch (300/480 kbps)
Loop points: Up to 1 point
15 MiB or less
240 seconds or less
If audio data with playback time that exceeds 240 seconds is included in a system software theme, an error will occur during package creation. If a theme that includes audio data with playback time that exceeds 240 seconds should happen to be distributed, the system will determine it to be invalid BGM, and the BGM will not be played back.
LoudnessThe recommended range and upper limit for BGM loudness values are as follows. Note that the recommended range has values for approximating a loudness that is not significantly different from the system default BGM.
Recommended range: -41 to -31 LKFS, Upper limit: -24 LKFS
How to make
Download and install Audacity
WAV (Microsoft) signed 16-bit PCM
at9tool -e -br 144 -wholeloop bgm_home.wav bgm_home.at9
bgm_home.at9 to sound/bgm_home.at9