GAMEN3_FinalDelivery/GAMEN3_FinalProject/Assets/VolumeSettings.cs

using UnityEngine;
using UnityEngine.Audio;
using UnityEngine.UI;

public class VolumeSettings : MonoBehaviour
{
    [SerializeField] AudioMixer audioMixer;
    [SerializeField] Slider volumeSlider;

    private void Start()
    {
        float savedValue = PlayerPrefs.GetFloat("MusicVolume", 0.75f);
        volumeSlider.value = savedValue;
        SetVolume(savedValue);
    }

    public void SetVolume(float sliderValue)
    {
        float volume = Mathf.Log10(Mathf.Max(0.0001f, sliderValue)) * 20f;

        audioMixer.SetFloat("MasterVolume", volume);
        PlayerPrefs.SetFloat("MusicVolume", sliderValue);
    }
}