Made a little file for you, and I hope it will get you some idea on how you can make your voice sample sound robotic.

http://www.lnctv.com/~a41154a/reason_files/vocoder.rns

Some notes about the rsn-file:

2 samplers with 2 different vocal-samples.
First you hear them "dry" (no vocoder-effect used on them).
Then you'll hear the samples with vocoder.
The subtractor is used to "change" the sound to a robotic-sound.

Let me know if you have any problem.

Sorry for those bad vocalsamples I used in the rsn-file.

Thanx for the reason file, I was having difficulty as well getting it to sound how i wanted it.

i got that far, but like you can kinda tell what the things saying, but it isn't as clear as i'd like ,but i dont want to make it dry, because i want it to sound robot, not vocals with somthing behind it kinda thing.

here's a sample:

http://members.rogers.com/djbard/iloveyou.mp3

Why not run the sample through the audio splitter then into the vocoder and another output of the splitter into a seperate chanel on the mixer and add see if that makes the vocals a bit more clearer for you.

Let me have the sample "dry" and I can try to tweak the vocoder.