Did you also install the Loquendo "engine" (the DLL files plus the folder TTS_Loq) that came with the download ? These files are language dependent. The package should be a Dutch" unity.
Edit
I do not use TTS, so I can't give much help, only try to.
I found some sys.txt lines that can make the difference (or not). Feel free to try.
[tts]
tts_buffer=131072
tts_logics=3
priority="HIGH"
always_say_road_names=1
announce_street_name=1
announce_exit_directions=1
skip_exit_numbers=0
[sound]
queue_length=200
[debug]
tts_min_ready_wav=1
tts_getaway_time=200
tts_expected_engine_delay=1400
reserve_memory=2097152
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