Customizing sounds
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This article will explain how to change the various sounds in Maemo OS 2008. If you are looking to change the ringtone, you can do that from the settings of the internet phone application. All other sounds are a bit more difficult to change.
Get your sounds
Find the sounds you wish to use. They must be in the ".wav" format. Put them on your device.
The apps you need
For this customization you will need the emelFM2 file browser that will allow you to navigate to hidden folders. In order to do customize sounds without the command line stuff you'll need personal menu which you probably already have.