I can't seem to find this app. What I want is a graphical representation of the tone of my voice (over time). I've been told that my voice is monotone when I

I can't seem to find this app. What I want is a graphical representation of the tone of my voice (over time). I've been told that my voice is monotone when I speak Western languages so I don't really have a good feel for what I need to do to speak in a high or low tone. If I had a graphical representation of what I was in fact doing then I think I could gain control over the tone of my voice more easily. I guess the obvious alternative is to record and play back my own voice.