Jeremy/Assets/Scripts/MusicManager.cs

using System;
using System.Collections.Generic;
using UnityEngine;

public class MusicManager : MonoBehaviour
{
    public enum Track
    {
        None,
        Cozy,
        Trash,
        TrashPlusBuilding,
        TurnAround,
        TurnAroundPlusJeremyLives,
        FinaleBuildUp,
    }

    private Track currentTrack = Track.None;
    private List<AudioSource> currentlyPlaying = new();

    [SerializeField]
    private AudioSource _CozySource;
    
    [SerializeField]
    private AudioSource _TrashSource;
    
    [SerializeField]
    private AudioSource _AdditiveBuildingSource;
    
    [SerializeField]
    private AudioSource _TurnAroundSource;
    
    [SerializeField]
    private AudioSource _AdditiveJeremyLivesSource;
    
    [SerializeField]
    private AudioSource _FinaleBuildUpSource;

    public void PlayMusic(Track track)
    {
        switch (track)
        {
            case Track.None:
                break;
            case Track.Cozy:
                break;
            case Track.Trash:
                break;
            case Track.TrashPlusBuilding:
                break;
            case Track.TurnAround:
                break;
            case Track.TurnAroundPlusJeremyLives:
                break;
            case Track.FinaleBuildUp:
                break;
            default:
                throw new ArgumentOutOfRangeException(nameof(track), track, null);
        }
    }

    private void Update()
    {
        var fadeMultiplier = 0.2f;
        
        if(currentTrack == Track.Cozy)
        {
            if(!_CozySource.isPlaying)
                _CozySource.Play();

            _CozySource.volume = Mathf.Clamp(_CozySource.volume + (fadeMultiplier * Time.deltaTime),0,1);
        }
        else
        {
            _CozySource.volume = Mathf.Clamp(_CozySource.volume - (fadeMultiplier * Time.deltaTime),0,1);
            if(_CozySource.volume == 0 && _CozySource.isPlaying)
                _CozySource.Stop();
        }
    }
}