Well, it’s all relative. A soprano recorder is a soprano recorder – wooden, plastic, or otherwise, it is shrill. I actually don’t think that a wooden recorder is any more mellow than a plastic one, if they are both of the same era, design-wise (baroque, earlier, etc). I don’t think we want to encourage this beginner to rush out and buy a wooden recorder in the mistaken impression that it will be less bothersome to neighbors. A beginner should stick with plastic, IMHO.