http://www.colour-burst.com/blog/
I've popped a post on my site about using syphon as an effect loop in resolume, and it should work in modul8 too, though you'll have to edit the text field for the app in quartz to try that...
Let me know if you like it, or it doesn't work, or it crashes...
I did have a couple of crashes that could have been related, the datamosh and glitch plugins have crashed on me before in vdmx...