I have a venture with the inbuilt sat nav and I emailed TomTom asking about speed related volume, I find the lack of it a real pain in the behind
Got the reply below so maybe we should start a campaign to get all Mazda owners with this sat nav fitted to raise a case with TomTom, probably won't get us anywhere but if we don't try we won't get.
Other than that the car is great, although it did manage to get hit by two stones in its first 400 miles
TomTom response below
Thank you for your email.
The option to link volume to car speed is a feature that has appeared on several of our stand alone units in the past but presently isnt available on our automotive device.
I have passed your comments on the feature to our software development team, and although I dont know if this is a feature they intend to add in the future, the more pressure from customer such as yourself the more likely (and quicker) a feature will be implemented via a software update in the future.
Thank you for taking the time to make the suggestion as one of the best ways we can improve our products is through customer feedback.
If you do have any more queries, please don't hesitate to contact me or one of my colleagues and we will be more than happy to help.