HandInfoPanel.cs

    void Audio()
    {
        if (audioButton.GetComponent<ButtonToggle>().ToggleState != audioSource.isPlaying)
        {
            audioButton.GetComponent<ButtonToggle>().ToggleState = audioSource.isPlaying;
        }
    }

    public void AudioToggle(bool start)
    {
        if (start)
        {
            audioSource.Play();
        }
        else
        {
            audioSource.Stop();
        }
    }