net.peeweek.gameplay-ingredients/Runtime/LevelScripting/Actions/AudioMixSnapshotAction.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using GameplayIngredients;
using GameplayIngredients.Actions;
using UnityEngine.Audio;

public class AudioMixSnapshotAction : ActionBase
{
    [NonNullCheck]
    public AudioMixer Mixer;
    [Min(0.0f)]
    public float TimeToReach = 1.0f;
    public string SnapshotName = "master";

    public override void Execute(GameObject instigator = null)
    {
        Mixer?.TransitionToSnapshots(new AudioMixerSnapshot[]{ Mixer.FindSnapshot(SnapshotName)}, new float[]{ 1.0f}, TimeToReach);
    }

    public override string GetDefaultName()
    {
        return $"Set Mixer Snapshot:'{SnapshotName}' ({TimeToReach})s";
    }
}