I'm using iGO Navigation 9.18.27.693527, the tts you have to enable it first in your phone settings, under language and input (make sure you hear the output in the setting). then in igo -> content -> voice folder place in the TTS voice you want, I found than if I have more than one TTS voices would clash so I just placed the one I wanted to use.
Start up IGO and then settings, regional settings, voice language and select the TTS voice you placed (should say it pronounces street names) it'll playback the voice when selected.
note: in phone settings I just used standard google tts (downloaded appropriate language or so) I didn't install the vocalizerex app and still works fine. (phone not rooted as well)
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