The MKDD Plus Expansion Pack plays Plus's track music in stereo. It works only with MKDD Plus as the level pack, and is about 720 MB.
Get the Expansion Pack (see the MKDD Plus wiki page) and extract it.
Copy the download's files folder into mods/audio/:
files
mods/audio/
sdmc:/switch/MKDD-NX/mods/ plus/ audio/ files/ AudioRes/Stream/...
Restart the game. Mods > Stereo Music is on by default; turning it off or on takes effect after Restart now.
The setting shows NONE FOUND when mods/audio/ is missing, and PLUS ONLY when another level pack is picked.
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