"Marble has a route guidance mode that can make use of speakers (pre-recorded sound files) to indicate directions. There are some existing ones to download at http://edu.kde.org/marble/speakers.php and instructions to install them at http://userbase.kde.org/Marble/CustomSpeakers#Voice_Installation and also instructions how to record a custom voice at http://community.kde.org/Marble/VoiceOfMarble. Your task is to combine these information into a comprehensible guide that describes how to record and install a custom voice such that in the end one has Marble speak your own voice in guidance mode.
Expected results: A finished section http://userbase.kde.org/Marble/CustomSpeakers#Creating_Custom_Voices that users can easily follow.
Prerequisites: An installation of Marble 1.2 (KDE 4.7). Can be compiled from source code as well. An installation of Marble on the N900 would be nice, but is not absolutely necessary."