Seek no more! For with a website, a free audio editing program, and a few simple steps you'll have your robot underlings talking to you in no time. You can modify the settings to get your own effects. The instructable shows you how to make on that sounds similar to "Otto" (auto) in Wall-E, but that is purely coincidental.
Step 1: Start with a text to speech program
Now type in the words you want your robot to say. For my first one typed "Hello Master Ryan. How may I assist you."
Now click on "SPEAK". If you like the results, click "Back" in your browser, and then select "DOWNLOAD" instead. Save the file with a unique name. I used "hellomasterryan.wav".
Note: You might have to tweak it to get it to sound the way you want. For example, I spelled my name as "rie an" to get it to sound the way I wanted.