pe1agp is a TomTom expert and uses a Rider !
So If he says TTS won't work, don't expect it to.
Although if I ever get my hands on a Rider I don't think I will be able to resist trying.

Since discovering SE Navcore's I have lost count of the number of Navcore's I've tried on my ONE but have only used 9.160 and 9.200 without MB for any extended period.
Both where created by me using DSA's tool.

Only by selecting the Rider skin have I ever lost sound !

TTS voices never need activating.