Thank's TomTom13,
I can't get it to work. Am I the silliest guy on earth?
Spoiler: What I did:
- used ClearFlash Tool on my Rider2
- cleared the SD
- installed Navcore 9.500 Memory Boost HS (this Navcore has a TT-DSA - Skin Chooser on Menu Page 7
- installed map Benelux_930_5563 (has TTS support)
- copied spoken voices to voices folder in SD root
- copied your sounds and VocalizerTTS folder to SD root
- used Fastactivate to patch maps nad voices
- Started the TT Rider
- choose English UK language
- When using Menu/Voices/Change Voices -> there is no Serena voice only the spoken voices I added, I choose "Jane"
- When using Menu/Voice preferences only possible selection :
___Read early warning ... YES / no
___Replace spoken inst. ... beep NEVER

Do I have to activate TTS somewhere?
Which exact navcore did you use?
Did you use a patch-tool to get your DSA-Navcore