Right now the only way to layer music tracks is by loading up your music stems into a sequencer and controlling the various mixes you want with a set of Control Busses and Mixer Devices. In the example pictured, I have 3 separate music stems, and each stem has its own Control Bus and its own Control Bus Mix to control the volume of the stem. You can then use the event functions to change the mix of the stems based on your gameplay. When setting up your music sequence, make sure to set your Clock Source to Audio which will keep your music stems in sync with each other.
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