[chrisso]

As above, having sold my Doepfer system several years ago, the module numbers mean nothing to me.
Do you have an audio input module?

The results you describe sound like you aren't getting enough audio level into your modules (via an audio input). But as Beer rightly points out, it's hard to pinpoint any other problem from a distance.
Audio processing with a modular system is pretty straightforward, but it helps if you have at least one audio input module and an output module (VCA).