I just started using Pure data and I have to do a live interactive patch for a project,
decided to go with a simple live video feed with keys and bangs,
Im trying to have it so that I press the numbers 1 - 9 and the video effect changes
so Im using a lot of pix objects
pix_compare,
pix_delay etc etc.

I can get one gem head with one effect to bang on and off but when I add another gem head with another effect it wont work? Its just a white rectangle with no live video feed.
What am I doing wrong?
Can someone give me an example of what I should be doing so I can have 2 different video effects that bang on and off?

http://www.pdpatchrepo.info/hurleur/Project.pd

if the you only have one live video, you can use [separator] object to feed the stream to different effect, and then use [multiplex] to decide which effect texture to rectangle.
use the help of the object to find more details.