Sorry Naomi - I read that wrong. I suppose it also matters how close you were to the person who has gone. If I'm to be honest I wasn't that close to my mother. I was saddened by her dying of course, and it wasn't pleasant as she had breast cancer, but I was never able to get close to her. My mother had a lot of problems when I was young such as never getting over my brother's birth (post-natal depression now) and moving from place to place abroad.
If you had a normal (whatever that is) relationship with your mother then it seems you feel differently about her voice (I really am learning an awful lot on here tonight!). You are lucky and I'm sure you treasure your memories as Ummm obviously does.