I'm sure that I like your tone of voice. Don't take that tone of voice with me! Your tone of voice belies the sincerity of your statement.
It actually depends on who's singing and how they sing, but normally, the is yes.
You are not used to hearing your own voice wavelengths, your vocal cords do not correspond with the wavelengths and pitch of your voice, thus saying that your voice will sound different
It depends, if you are looking for the absolute value then it would be equal. It is different if it is negative and positive.
Monotone or monotonous.