A-119 input module. That will get your guitar up to line level. It also has an envelope follower, which is very handy for guitar. Low pass filters don't really do much for guitar except at the most extreme settings. The multi-mode filter, vactrol filter, and triple-resonant filter are all capable of more subtle stuff with guitar tones.

Other than that, a lot of the modules are pretty much like stomp boxes except for the fact that they can be voltage controlled. So, having lots of interesting control voltage sources is what's going to distinguish you from a guy with a bunch of pedals. So, consider getting LFOs, sample and hold, random voltage sources, maybe a theremin module or foot controller module.

-hope that helps
-neil

--- On Mon, 5/26/08, madeintheshade29017 < madeintheshade29017@... > wrote:

> From: madeintheshade29017 < madeintheshade29017@... >
> Subject: 1 Doepfer modular for guitars
> To: Doepfer_a100@yahoogroups.com
> Date: Monday, May 26, 2008, 7:49 AM
> Hi to all I'm new here and I wish to know what kind of
> module I can buy
> for use a-100 with guitars, I want start with 10 or 20
> module for
> create a space sound with guitars.
> Please help me!!!!!
> Bye Matt