Lars2500: I want to make everyone aware that there is an official patch 1.02 for Amnesia - A Machine For Pigs available:
www.frictionalgames.com/forum/thread-23416.html

This fixes other issues still present in version 1.01, including one I had with the sound not working properly. I fiddled hours around with this before finally in the depths of that forum, I stumbled across that thread. (The patch is actually available since October 2013, but you will find no mention of it anywhere on the web other than there.)

The patch works out-of-the-box only with Frictional Games' version of AAMFP, but by copying the files manually into the game folder it can be used with any other installation, including the GOG version.

Perhaps GOG is able to make an own 1.02 patch installer? It would have saved me some frustating hours.