Try The Output GPI file in a Nuvi.
Those voices i send you work well, the whole of garmin Community in South Africa is using them.
Try to use a GPX file instead of a CSV file.
<wpt lat="-17.805013479664922" lon="31.081711482256651">
<name>60 Kmh Fixed Cam ? 1102</name>
<cmt>?</cmt>
<desc>?</desc>
<link href="C:/GPS%20Sounds%20Mp3/FC%2060.mp3"/>
<sym>Scenic Area</sym>
<extensions>
<gpxx:WaypointExtension xmlns:gpxx="http://www.garmin.com/xmlschemas/GpxExtensions/v3">
<gpxx:Proximity>250</gpxx:Proximity>
<gpxx:DisplayMode>SymbolAndName</gpxx:DisplayMode>
</gpxx:WaypointExtension>
</extensions>
</wpt>
You can use Mapsource to make the GPX file with Link Attachment.
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