I think having mixers as a per-scene option would be too limiting for those who want fine control.
Aside from using snapshots to change how they behave (placed in an OnStart cutscene), it'd be trivial to write a custom Action that changes the asset file reference instead:
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Aside from using snapshots to change how they behave (placed in an OnStart cutscene), it'd be trivial to write a custom Action that changes the asset file reference instead:
AC.KickStarter.settingsManager.musicMixerGroup = myNewMixer;