Can you Use a Vocoder with a Yamaha DGX 500?

I don't know if you can, since I am a guitar player, but if you go onto youtube and do a search on "how to make your own talkbox", I know there was a guy on there that made a killer one for about $10, and he hooked it up to he keyboard and it sounded amazing. I would think if it has a ΒΌ" jack, you should have no problems.