One of MCPI-Reborn's main modifications is a sound-engine since MCPI doesn't include one by default[^1]. However, it can't be used out-of-box because MCPI doesn't contain any sound data and MCPI-Reborn can't include it because of copyright.
MCPE's sound data can be extracted from any MCPE v0.5.0[^2] APK file, just place its `libminecraftpe.so` into `~/.minecraft-pi/overrides` and you should have sound!
[^1]: The mute button is just leftover code from MCPE, it doesn't actually do anything in un-modded MCPI, however it is connected to MCPI-Reborn's sound-engine.
[^2]: This isn't a hard limit, an MCPE v0.8.1 APK would probably work, but don't rely on it.
