Unity Audio Manager for Sfx and Music

PlayMusic.cs

using UnityEngine;

public class PlayMusic : PlaySfx {
    [SerializeField] private bool repeat;

    public override void Play() {
        soundManagerController.PlaySfx(audioClip, volume);
    }

    void OnDestroy() {
        if (playWhen == SoundManagerController.EventType.BeforeDestroy) {
            Play();
        }
    }
}

PlaySfx.cs

using System;
using UnityEngine;

public class PlaySfx : MonoBehaviour {
    [SerializeField] protected SoundManagerController.EventType playWhen = SoundManagerController.EventType.Other;
    [SerializeField] [Range(0, 1)] protected float volume = 1f;
    [SerializeField] protected AudioClip audioClip;

    protected SoundManagerController soundManagerController;

    void Start() {
        GameObject soundManager = GameObject.FindWithTag("SoundManager");

        if (audioClip == null) {
            throw new ArgumentException("No `AudioClip` added to script");
        }

        if (soundManager == null) {
            throw new ArgumentException("No `SoundManager` object found");
        }

        soundManagerController = soundManager.GetComponent<SoundManagerController>();

        if (soundManagerController == null) {
            throw new ArgumentException("No `SoundManager` object found");
        }

        if (playWhen == SoundManagerController.EventType.StartScript) {
            Play();
        }
    }

    void OnDestroy() {
        if (playWhen == SoundManagerController.EventType.BeforeDestroy) {
            Play();
        }
    }

    public virtual void Play() {
        soundManagerController.PlayMusic(audioClip, volume);
    }
}

SoundManagerController.cs

using System.Collections.Generic;
using UnityEngine;

public class SoundManagerController : MonoBehaviour {
    public enum EventType {
        StartScript,
        BeforeDestroy,
        Other
    }

    private static SoundManagerController instance;
    private AudioSource effectSource;
    private AudioSource musicSource;
    private float savedVolume = 0f;

    public static SoundManagerController Instance => instance;

    private void Awake() {
        if (Instance == null) {
            instance = this;
        } else if (Instance != this) {
            Destroy(gameObject);
        }

        DontDestroyOnLoad(gameObject);

        if (musicSource == null || effectSource == null) {
            effectSource = gameObject.AddComponent<AudioSource>();
            musicSource = gameObject.AddComponent<AudioSource>();
            musicSource.ignoreListenerPause = true;
        }
    }

    public void PlaySfx(AudioClip clip, float volume) {
        // TODO multiply by global volume
        effectSource.PlayOneShot(clip, volume);
    }

    public void PlayMusic(AudioClip clip, float volume) {
        // TODO multiply by global volume
        musicSource.clip = clip;
        musicSource.volume = volume;
        musicSource.Play();
    }

    public void TogglePauseSfx(bool pause) {
        if (pause) {
            AudioListener.pause = true;
            savedVolume = musicSource.volume;
            musicSource.volume /= 2;
        } else {
            AudioListener.pause = false;
            musicSource.volume = savedVolume;
        }
    }
}