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MetaSounds
MetaSound is an audio system in Unreal Engine that provides control over a Digital Signal Processing (DSP) graph for generating sound sources. Using MetaSounds, you can generate audio synthetically at runtime and mix procedurally generated sound with other audio sources.
MetaSounds can be triggered and controlled by gameplay events in real time. For example, you could have a wind sound in your level that changes depending on how fast and in what direction the player is moving.
You can edit MetaSound sources in the MetaSound Editor. In the editor you can create nodes that make or alter sounds based on different inputs.
Station Example
In this station, there is a tuning fork that plays a procedurally generated song. To change the song, click the fork and go to the Details panel. In the Sound section, find MS_TuningFork. Double-click the preview image to open the MetaSound Editor.
Try changing the random seed used to generate the song. In the Members panel, click Seed. Then, in the Details panel, change the Seed value. Listen to the song to hear how it changes.
For more about Metasounds, read the MetaSounds documentation.