First, you need to convert text to voice. Sure, you could make your own recordings, but robots don't start with human sounds. They start with computer
sounds. So, go to http://www2.research.att.com/~ttsweb/tts/demo.php
and change the voice to "Mike . . . . . . . US English."
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.