Zoom 1204 Vocoder Problem

[johhnyboy]

Hi,
I recently bought myself a zoom 1204 effects unit off ebay. However, I cannot work out how to get the vocoder working. Is it complicated or is my unit just broken? Any help appreciated.

Dan

 

[MadAudio]

Here's the manual. See page 28.

http://www.samsontech.com/products/relatedDocs/1204.pdf