As you can see from the photo each tine of the Kalimba has a small piece of tin wrapped around it which vibrates as the tine vibrates giving a distinctive character to the sound. As the accompanying audio demo shows these vibrating bits of tin sound very interesting down a few octaves.
Anyone who owns the Sampler instrument in Ableton can expand Simpler to get access to the individual samples and re-tune or muck around with the "chance" of various tines being struck in the "round robin" channel.
Chuck a guitar amp plugin on the end of it and you will have a pretty good CongoTronics sound happening.
Download Kalimba 50 Rack