GNUsound stores its configuration information in a text file in the location ~/.gnome/gnusound. Although some of the most important properties that are stored in this file can be edited from within GNUsound itself, this file also contains other options that might be of interest. For example, it contains the colors that GNUsound uses to draw various parts of the interface. You can change these here if your aesthetic sensibilities differ from those of the author. Some of the more obscure options there may be documented in the pref.c file.

It should be understood that editing the configuration file in this fashion may yield unexpected results. Also there is always a chance that the format of the file will change in the future, as well as the meaning of the properties and their values.

GNUsound saves all it's files as standard .WAV files. However not all of GNUsound's document settings can be preserved in the .WAV file format. Rather than inventing yet another sound file format, GNUsound saves the extra data alongside the sound file in a text file with the extension .USX. This file keeps track of the selection settings, markers, envelopes and mixer settings. This file is fairly self-explanatory and it doesn't hurt to edit it by hand.