I question what he is saying.

i have no sound anymore on my TomTom.
No voices, no warnings, etc
The rest works fine.
...(there are no drums)...
If there is no drum roll but everything else works OK.

Then it is this:

Hardware problem? Speaker, connectors, wires, chip...
as " Boki_Srb" points out.
This brings my back to is this a secondhand unit and it was always broke?

More details have to come from the user.......