ToughDiamond wrote:
I think a good way to start is to make a recording of your voice as it is now, listen a few times, and then try again. Maybe also try a few "talking books" or any other recordings of spoken word, and try to record yourself imitating the speaker. Also this is one area in which role models might help - if there's anybody out there whose speaking voice you admire, listen to their recorded work and see if you can emulate it. Of course it's better if you can find somebody you trust to advise you on your weak points and how to correct them, but I think usually it's pretty obvious when you hear yourself on the recording.
I tried something similar to this today - I found movie scripts online and recorded myself reciting bits of dialogue. I did the first recording speaking the way I normally would and, after finding my weak points, tried improving on subsequent recordings. Each recording got a little better. I have to say, it is very difficult for me to add inflections to my monotonous tone, but I
am learning how to speak more clearly and crisply.