Hi Martin, don't know what kind of phone you have, but with iOS 14.4.2 you might try going to Settings->Accessibility->Spoken Content->Speaking Rate to set the desired rate of voice.
Hope that helps - and if not sorry!
@Paolo-16 I apologize for interrupting but if I understand your problem I think you need to use the "Export" function (with your Garmin Nav VI plugged into the computer running MRA) but select "Garmin (old) GPX 1.0" as the desired data format.
After the export completes, you can unplug your Nav VI from the usb cable and when you restart it you will see a message "New routes found. Import to trip planner?" - Select "Yes". Then you will see a screen with the name of the route(s) which you just exported from MRA. Select that route with a checkmark. The Nav VI will start the calculation as it converts to a Nav VI route.
When that is finished, from the main screen (Where To? View Map) in the Nav VI select "Apps" from the bottom area - and then select "Trip Planner" - go to the bottom of the list (if there are other trips) and you will find a section "Unscheduled Trips" and your route. Select that route and you will see all your waypoints.
A caveat - if you have waypoints are actually "shaping" points, you can change those into shaping points by using the "Edit Destinations" menu selection on the Nav VI trip planner menu.
Hope this is what you were asking about - if not sorry!