How to increase volume on my Garmin Nuvi 3760T?

I am using Garmin Nuvi 3760T and my friend told me that if I will get into the voice section in my Garmin and then I can open the VPM file for the command voice to increase the volume in the text. But when I trying to open the VPM file, they told me to download it and then have to scan and then pay $2 to open the site. Cant I do it without paying any money?

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