You're playing speech through a character, or by manually playing a voice clip on a regular Sound object?
The Speech Manager has sliders to reduce music / sfx when speech plays, but this is off by default. So long as you don't play two sounds on the same Sound object, then one shouldn't cut out the other.
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The Speech Manager has sliders to reduce music / sfx when speech plays, but this is off by default. So long as you don't play two sounds on the same Sound object, then one shouldn't cut out the other.