Voice Cloning

Overview

Voice cloning creates a custom voice from a reference audio sample. Use it to:

• Personalize TTS — Generate speech in a specific voice
• Create characters — Unique voices for games or media
• Accessibility — Preserve a person's voice
• Localization — Maintain voice consistency across languages

Getting Started

Download a Voice Cloning Model

izwi pull qwen3-tts-0.6b-customvoice

Clone a Voice

1. Prepare a reference audio file (5-30 seconds of clear speech)
2. Use the voice for TTS generation

Using the Web UI

Step 1: Upload Reference Audio

1. Navigate to Voice Cloning in the sidebar
2. Upload a reference audio file
3. The audio should be:
   • 5-30 seconds long
   • Clear speech, minimal background noise
   • Single speaker

Step 2: Generate Speech

1. Enter the text you want to speak
2. Click Generate
3. Listen to the output in the cloned voice

Step 3: Save and Reuse

• Download generated audio
• Save the voice profile for future use

Using the CLI

Generate with Reference Audio

izwi tts "Hello, this is my cloned voice" \ --model qwen3-tts-0.6b-customvoice \ --speaker /path/to/reference.wav \ --output cloned.wav

Options

Using the API

Endpoint

POST /v1/audio/speech

Request (multipart/form-data)

Example (curl)

curl -X POST http://localhost:8080/v1/audio/speech \ -F "model=qwen3-tts-0.6b-customvoice" \ -F "input=Hello, this is my cloned voice" \ -F "reference_audio=@reference.wav" \ --output cloned.wav

Reference Audio Guidelines

Ideal Reference Audio

Good Examples

• Podcast clips
• Interview segments
• Voice memos
• Audiobook excerpts

Poor Examples

• Music with vocals
• Multiple speakers
• Heavy background noise
• Very short clips (<3 seconds)
• Whispered or distorted speech

Tips for Best Results

1. Quality over quantity — A clear 10-second clip beats a noisy 30-second one
2. Natural speech — Avoid monotone or exaggerated delivery
3. Match content — Reference emotion should match desired output
4. Consistent volume — Avoid clips with volume changes
5. No music — Background music interferes with cloning

Available Models

Larger models produce more accurate voice clones.

Ethical Considerations

Voice cloning is a powerful technology. Please use it responsibly:

• Get consent — Only clone voices with permission
• Don't impersonate — Never use cloned voices to deceive
• Respect privacy — Don't clone voices without authorization
• Legal compliance — Follow applicable laws and regulations

Limitations

• Accent accuracy — May not perfectly capture all accents
• Emotional range — Cloned voices may have limited expressiveness
• Unique characteristics — Some voice qualities are hard to replicate
• Language — Best results in the model's primary language

See Also

• Voice Design — Create voices from descriptions
• Text-to-Speech — Standard TTS
• Models — Download models