It is not clear from your post what garmin unit you have? Is it running alternate firmware eg. 37xx to make 34xx? or is it a standard unit? It would help to know in order to advise what steps are necessary.
As stated, some of the voice files are available via webupdater others (such as ASR,SRX) are only available with the downloaded maps.
The Unit, Firmware and type of map (Navtech/Sensis) also determines whether ASR 1 or ASR 2 files are required.
On 2xxx and 3xxx series it may also be necessary to 'activate' some features by loading relevant XML files (example /Garmin/DeviceConfig_MP3_Enabled.xml). Check out the thread on modding 37xx to 34xx to get an idea. [Only registered and activated users can see links. ]
For detailed answer to you need to tell us the model and firmware used. ;-)
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