Voice Studio is the unified workspace for reusable voices. In the current app, open Voices from the sidebar to manage saved voices, browse built-in voices, and create new cloned or designed voices. The legacy /voice-cloning and /voice-design routes redirect into this workspace when Voice Studio is enabled.

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What You Can Do

WorkflowWhat it does
Saved voicesList, preview, reuse, and delete voices saved from cloning or design workflows.
Built-in voicesBrowse model-provided speaker presets and generate preview samples.
New VoiceStart a cloned voice from reference audio or a designed voice from a text prompt.
ModelsDownload, load, unload, or switch the models needed for built-in voices and voice design.
Use in TTSSend a saved voice or built-in speaker directly to the Text to Speech page.

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Using the Web UI

  1. Open http://localhost:8080.
  2. Select Voices in the sidebar.
  3. Use the Saved, Built-in, or All views to find a voice.
  4. Select New Voice to create a cloned or designed voice.
  5. Select Use in TTS to continue generation in Text to Speech.
The Models action opens the same route-aware model manager used elsewhere in the app. Built-in voice previews require a compatible built-in voice model to be loaded.

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Saved Voices

Saved voices are reusable voice assets stored by the local server. A saved voice can come from:
  • A reference-audio voice clone
  • A prompt-designed voice
  • A generated voice source saved through the API
Saved voices can be previewed, deleted, and reused in Text to Speech. The API surface is /v1/voices, and izwi tts can reuse a saved voice with --saved-voice-id. 
izwi tts "Use my saved narration voice." \
  --model Qwen3-TTS-12Hz-0.6B-Base \
  --saved-voice-id voice_abc123 \
  --output narration.wav

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Built-In Voices

Built-in voices are model-provided speaker presets. Voice Studio shows the available speakers for the selected model, can generate short preview samples, and can send a speaker into Text to Speech. Use built-in voices when you want quick, repeatable presets without reference audio or a design prompt. Use saved voices when you want a custom reusable voice asset. See Voice Presets for the current speaker IDs.

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Creating New Voices

Select New Voice from Voice Studio to choose a creation flow:
FlowInputBest for
CloneReference audio plus reference transcriptReusing an existing permitted voice
DesignNatural-language voice descriptionCreating a new synthetic character or style
See the dedicated guides for details:

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API Routes

Route familyPurpose
/v1/voicesSaved voice list/create/delete/audio routes
/v1/voice-clonesPersisted voice-cloning generation history
/v1/voice-designsPersisted voice-design generation history
/v1/audio/speechImmediate generation with built-in speakers, saved voices, reference audio, or design instructions
See the API Reference for exact saved voice fields and the Audio Speech API for generation inputs.

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See Also