For a variety of reasons and purposes a large proportion of my synth/electronics time seems to be spent modifying others' modules. This page more or less gathers these in one place: most of the instructions for doing the Doepfer mods are available at the Yahoo! group, but are rather spread about there, so I will try and collect them together here as time allows; some of the Plan B mods have often arisen out of discussions at the MuffWiggler forum, and generally the pages linked below will refer to any relevant discussion:
Links for other modifications
Doepfer have a dedicated A-100 DIY page, containing not only various modifications to specific Doepfer modules, but also ideas on how to modify modules more generally, and basic explanations of some simple circuits.
Nick Keller has a page of interesting mods at the analoguehaven site, the distributor for Doepfer gear in the US.
[Page last updated: 02 Jan 2015]