Speed up the music

[ColdSteel48]

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Another alternative is to build your music such that you get a new cue point at the beginning of each bar, and record the music in a number of different tempos, and slice each recording into bars, and switch which recording you take the next bar from. This requires very precise authoring of the music, and of the sound cue playback selection. If you’re using pre-purchased music, you’re kind-of out of luck on that one. Also, for the very-precise sound cue selection, I’m not sure the default Unreal Engine sound cues can do this for you; you might need to write a bit of custom C++ to get there.
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Well Actually to do the last thing - a naive approach is much better than tackling with C++ and Precision:
I found my self having 2 Audio Components (and using them as a double buffer) - each time a Time Dilation changes I am fading out current AudioComponent set correponding Sound to another sound component and fading it in - and the Precision is good enough!