Turn Text Into a Spoken Voiceover (Korean & English) via Google's Gemini TTS
Turn text into a natural spoken voiceover inside a CNAPS Studio flow. Six named narrator voices (Kore, Puck, Charon, Aoede, Leda, Fenrir), two model quality tiers (Flash TTS / Pro TTS), and native support for Korean and English. Runs on Google's servers via API.
🔑 Requires a Google / Gemini API key
What it does
This node connects your CNAPS Studio flows to Google's Gemini API to turn written text into spoken audio. Give it a text prompt in Korean or English, pick a narrator voice (each with a different personality) and a model tier (Flash TTS for speed and cost, Pro TTS for higher quality), and it returns a voiceover audio clip. Unlike a traditional TTS engine, Gemini TTS is a language-model-based TTS — it doesn't just pronounce words phonetically; it also understands how to say them (tone, emotion, pace) from context. CNAPS Studio supports Gemini TTS 3.8 through the Gemini API. Select an available model variant in the node and configure the voice and language settings for your narration. Gemini TTS runs on Google's servers using your configured Google/Gemini API key, and the provider bills your account directly. In the standard cloud version of CNAPS Studio, Qwen3-TTS runs on CNAPS infrastructure. Neither option requires a GPU or downloaded model weights on your computer.
Problem it solves
- High-quality voiceover from text — Google's LLM-powered TTS produces natural-sounding, expressive speech that generally exceeds traditional (phoneme-based) TTS quality
- Six distinct narrator personas — Each preset voice has a different character (firm, upbeat, informative, breezy, youthful, excitable), so you can pick one that matches your content
- Two speed/quality tiers — Flash TTS for fast, low-cost narration; Pro TTS when quality matters most
- Korean + English support — Bilingual out of the box (the upstream model actually supports 79 languages; the studio exposes the two most common)
- No local GPU needed — Runs entirely on Google's infrastructure through the API
- Podcast, audiobook, video narration — Cloud-scale audio generation for long-form scripts without local compute cost
- Language auto-detection — In Auto mode, the model detects the language from the text itself; you can override for mixed or ambiguous content
Configuring the Node
Basic Settings
Text to speak — Input text in Korean or English.
Model variant — default Flash TTS
Variant | Best For |
Flash TTS | The fast, cost-efficient tier (Gemini Flash TTS Preview) |
Pro TTS | The higher-quality tier (Gemini Pro TTS Preview) |
Prebuilt narrator voice — default Kore. Six named voices, each with a distinct character:
Voice | Character |
Kore | Firm |
Puck | Upbeat |
Charon | Informative |
Aoede | Breezy |
Leda | Youthful |
Fenrir | Excitable |
Advanced Options
Spoken language hint (Auto / Korean / English, default Auto)
- Auto — model detects the language from the input text itself (recommended)
- Korean / English — force pronunciation in the chosen language, useful for mixed or ambiguous content
Output: Audio file (WAV) containing the spoken voiceover in the selected voice
Accuracy & Speed
Type | External API model (runs on Google's servers) |
Provider | Google — Gemini API |
Model variants (UI-exposed) | Flash TTS (default, fast tier) · Pro TTS (higher-quality tier) |
Voices (UI-exposed) | 6 named voices: Kore, Puck, Charon, Aoede, Leda, Fenrir |
Voices (upstream model total) | 30 — the full Gemini TTS voice library also includes Zephyr, Orus, Autonoe, Enceladus, Umbriel, Algieba, Despina, Erinome, Algenib, Rasalgethi, Laomedeia, Achernar, Alnilam, Schedar, Gacrux, Pulcherrima, Achird, Zubenelgenubi, Vindemiatrix, Sadachbia, Sadaltager, Sulafat, Iapetus, Callirrhoe — each with a different voice character |
Languages (UI-exposed) | Korean, English |
Languages (upstream model total) | 79 — including Korean, Japanese, Chinese (Mandarin), English, Spanish, French, German, Portuguese, Arabic, Hindi, and 69 more |
Requires | A valid Google / Gemini API key |
Local GPU needed? | No — the studio only sends text to the API and receives audio back |
Status | Preview — Gemini TTS is currently in preview status on the Gemini API |
How Gemini TTS compares
Gemini TTS is the external (API-based) option in CNAPS Studio's Text-to-Speech lineup:
Gemini TTS | Qwen3-TTS | |
Runs on in cloud Studio | Google's servers through the Gemini API | CNAPS infrastructure |
Requires | A configured Google/Gemini API key | No external provider API key |
GPU required on your computer | No | No |
Usage and billing | Billed through your Google provider account | Uses CNAPS usage capacity |
Key features | Google's speech generation with selectable voices | Custom voices, VoiceDesign, speed control, and pronunciation rules |
Compliance & Provenance
Provider | Google |
Provider type | GPAI — General-Purpose AI (GPAI) |
License | Google Cloud Terms |
EU AI Act risk class | Limited Risk |
Art. 50 transparency | Required — outputs are marked. See AI Policy §2. |
Region availability | Available globally |
Training data summary |
For more on how we classify models and mark outputs, see our AI Policy.