Each engine comes with its own voices; there is no separate Voices page. Open an agent from Agents, pick the Engine, then click the voice to open Choose a voice. It opens on the engine's recommended voices; Show all N voices lists every voice that engine has. Search, filter by gender and preview any voice before you pick it. You don't add voices anywhere first.
Engines and minutes, cheapest first
Your plan's minutes are standard minutes (a Vistrow Bharat minute). Other engines use more or less of them per call minute:
- Vistrow Lite: 0.85 standard minutes per call minute. Each voice speaks one language.
- Vistrow Bharat: 1 standard minute per call minute. Indian voices that switch language mid-call, plus your cloned voices.
- Vistrow Expressive: 1.1 standard minutes per call minute.
- Vistrow HD (the default) and Premium: 1.5 standard minutes per call minute.
- Any cloned voice: 1.5 standard minutes per call minute.
- Vistrow Live and Duplex: 2 standard minutes per call minute.
Speech recognition and the AI model are bundled with each engine, so you only choose the engine and the voice.
One language or many
- Lite: picking a Lite voice sets the call language to that voice's language. If a caller asks for another language, the agent politely says the call continues in that language.
- Live: one voice speaks 99 languages and switches mid-call when the caller does.
- Duplex: male and female voices, each speaking one language: English, Hindi, French, German, Japanese, Korean or Portuguese. There is no male Hindi or male Korean voice.
Previews
Click play on any voice card. A sample is made the first time a voice is played and then kept, so replays start at once. It plays in the voice's own or regional language. Each account can play up to 30 new samples an hour; samples already made replay freely, with no limit. Each Duplex voice has one English voice sample in the style that suits it (casual, professional, warm, upbeat or calm); these play freely and never count toward the limit. To hear a Duplex voice in its own language, try it with a test call.
Cloned voices
Voice cloning is open on every plan. In the voice picker click Clone your voice: record about 15 seconds (at least 10), tick This is my voice, or I have written permission from the speaker., and read the consent sentence. Your cloned voices are listed under Vistrow Bharat. Creating a clone costs 42 standard minutes once (refunded if cloning fails; no plan includes free clones), and calls with it use 1.5 standard minutes per call minute.
Switching engines
If the new engine cannot speak the current voice, the agent switches to that engine's default voice, says so, and offers Undo. Click Save to keep the new engine and voice.