Troubleshooting

Dengjen is missing from NVDA’s synthesizer list, or fails to load. The two usual causes are the missing Visual C++ redistributable described in Requirements, and having no voices installed — the driver deliberately refuses to load when it cannot find at least one voice. Open the voice manager from NVDA’s main menu, install a voice, then restart NVDA.

A voice I just downloaded is not offered in NVDA’s voice list. Restart NVDA. A download refreshes the voice manager’s own list, but NVDA may still be holding the voice set it loaded at startup.

A preview or the voice list fails with a connection error. Both are fetched from the internet. Check your connection, then use Refresh voices list on the Download tab to retry.

"You cannot remove the currently active voice!" Switch NVDA to a different voice, or a different synthesizer, and then remove it.

Speech is slow to start or stutters. Prefer the low or medium quality voices, and consider the fast variant of your voice. Higher quality models need noticeably more processing per utterance.