section 688(2)


688(2) An appellant who is in custody and who is represented by counsel is not entitled to be present (a) at the hearing of the appeal, where the appeal is on a ground involving a question of law alone, (b) on an application for leave to appeal, or (c) on any proceedings that are preliminary or incidental to an appeal, unless rules of court provide that he is entitled to be present or the court of appeal or a judge thereof gives him leave to be present.