Unless a contrary intent appears elsewhere in this title, any right granted to a child by this title or by the constitution or laws of this state or the US may be waived in proceedings under this title if: 1) The waiver is made by the child and the attorney for the child 2) The child and the attorney waiving the right are informed of and understanding the right and the possible consequences of waiving it 3) The waiver is voluntary 4) The waiver is made in writing or in court proceedings that are recorded