This is an audio engine implemented in software by replicating the DJ's mixing method.
It supports real-time mixing and is lightweight enough to be used in rhythm games.
The libraries and languages used for implementation are Miniaudio, SoundTouch, Faust Language, and JsonCPP. Among these, some libraries include LGPL licenses, so this engine is also subject to the LGPL 2.1 license.
I confirmed that normal mixing is possible with an audio buffer size of 48 based on the 48000SR on the i7-10750 CPU.