public static Texture2D LoadTexture2D(string path)
    {
        string file = Directory.GetFiles(rootPath + path, Path.GetFileName(path))[0];
        
        return new WWW("file://" + file).texture;
    }

public static AudioClip LoadAudioClip(string path)
    {
        string file = Directory.GetFiles(rootPath + path, Path.GetFileName(path))[0];

        return new WWW("file://" + file).GetAudioClip(false,true);
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.A))
        {
            audioSource.clip = ResourceManager.LoadAudioClip("audio.ogg");

            Debug.Log(audioSource.clip.ToString() + " " + audioSource.clip.loadState);

            audioSource.Play();
        }
    }

Error: Cannot create FMOD::Sound instance for resource ȜB
, (Operation could not be performed because specified sound/DSP connection is not ready. )
UnityEngine.WWW:GetAudioClip(Boolean, Boolean)
ResourceManager:LoadAudioClip(String) (at Assets/ResourceManager.cs:25)
BaseClass:Update() (at Assets/BaseClass.cs:31)