vocalflow 0.6.1

Local TTS and audio transcription web app

VocalFlow

Local voice cloning, custom voices, voice design, and audio transcription — all in one web app.

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What is VocalFlow?

VocalFlow is a self-hosted web application that runs entirely on your local machine. It provides four core capabilities powered by the full Qwen3-TTS model family:

• Voice Cloning — upload a short reference audio clip and clone the speaker's voice for new text
• Custom Voice — use 9 premium preset speakers with instruction control for emotion, tone, and style
• Voice Design — create entirely new voices from natural language descriptions, no reference audio needed
• Audio Transcription — transcribe audio files with word-level timestamps

No cloud APIs. No data leaves your machine. Just your GPU doing the work.

Features

Voice Cloning (Base model)

• Upload a reference audio clip (3-10 seconds) and clone the speaker's voice
• Optionally provide a transcript of the reference audio for higher quality (ICL mode)
• Choose between 1.7B (best quality) and 0.6B (faster) model sizes
• Save cloned voice prompts as .pt files and reuse them without re-uploading audio
• 10+ languages: English, Chinese, Japanese, Korean, German, French, Russian, Portuguese, Spanish, Italian
• Auto language detection

Custom Voice (9 preset speakers)

• Speakers: Vivian, Serena, Uncle Fu, Dylan, Eric (Chinese), Ryan, Aiden (English), Ono Anna (Japanese), Sohee (Korean)
• Instruction control (1.7B only): tell the model how to speak — "say it angrily", "whisper softly", "speak with excitement"
• Choose between 1.7B (instructions + speakers) and 0.6B (speakers only) model sizes

Voice Design (create a voice from text)

• Describe the voice you want in natural language: age, gender, tone, emotion, speaking style
• No reference audio needed — the model invents a completely new voice
• Uses the 1.7B VoiceDesign model

Audio Transcription

• Upload any audio file (.wav, .mp3, .flac, .ogg)
• Choose from 6 Whisper model sizes (tiny to large) based on your speed/accuracy needs
• Full transcript with word-level timestamps
• Download as structured JSON
• Auto-detect language or specify manually

Smart Model Management

• Automatic model switching — only one model is kept in VRAM at a time; switching between models (e.g. Voice Clone → Transcribe) automatically unloads the previous model and frees GPU memory
• Manual unload — one-click button to release all GPU memory

Interface

• Clean dark-themed UI built with Gradio
• Compact sidebar with live-updating generation history
• Per-item download and delete buttons in the history sidebar
• Color-coded history entries per mode (Clone, Custom Voice, Voice Design, Transcribe)
• Inline audio playback
• Flash Attention 2 support for faster inference

Models

Qwen3-TTS (Speech Synthesis)

Model	Parameters	Purpose
Qwen3-TTS-12Hz-1.7B-Base	1.7B	Voice cloning from reference audio
Qwen3-TTS-12Hz-0.6B-Base	0.6B	Faster voice cloning
Qwen3-TTS-12Hz-1.7B-CustomVoice	1.7B	9 preset speakers + instruction control
Qwen3-TTS-12Hz-0.6B-CustomVoice	0.6B	9 preset speakers (no instructions)
Qwen3-TTS-12Hz-1.7B-VoiceDesign	1.7B	Create voices from text descriptions

• All models run in bfloat16 with SDPA attention
• Flash Attention 2 enabled when available
• Downloaded automatically on first use
• Requires a CUDA GPU with at least 6 GB VRAM

OpenAI Whisper (Transcription)

Model	Parameters	VRAM	Relative Speed
tiny	39M	~1 GB	~32x realtime
base	74M	~1 GB	~16x realtime
small	244M	~2 GB	~6x realtime
medium	769M	~5 GB	~2x realtime
large	1.5B	~10 GB	~1x realtime
turbo	1.5B	~6 GB	~8x realtime

• Models are downloaded automatically on first use
• Falls back to CPU if no CUDA GPU is detected

Requirements

• Python 3.11 and FFmpeg (winget install ffmpeg / brew install ffmpeg / apt install ffmpeg)
• SoX (winget install sox or install from sourceforge)
• CUDA GPU with 6+ GB VRAM for TTS (transcription can run on CPU)

Quick Start

Install

pip install vocalflow

Launch the web app

vocalflow

Then open http://localhost:5001 in your browser.

From source

git clone https://github.com/0xBinayak/VocalFlow.git
cd VocalFlow
uv sync
uv run app.py

First run: The TTS and Whisper models will be downloaded automatically on first use. Only the model you select is downloaded — you don't need all of them.

Project Structure

VocalFlow/
├── app.py              # Main web application (Gradio UI + all TTS modes)
├── transcribe.py       # Whisper transcription module (also usable as CLI)
├── main.py             # CLI entry points (vocalflow, vocalflow-transcribe)
├── pyproject.toml      # Dependencies and build config
├── uv.lock             # Locked dependency versions
├── models/             # Cached model weights (gitignored, created at runtime)
├── audio/              # Generated speech files (gitignored, created at runtime)
├── voices/             # Saved voice prompt files (gitignored, created at runtime)
├── uploads/            # Temporary uploaded files (gitignored, created at runtime)
├── transcripts/        # Transcription JSON files (gitignored, created at runtime)
└── .github/workflows/
    ├── ci.yml          # Lint + syntax checks on push/PR
    ├── release.yml     # Auto GitHub Release on version tags
    └── publish.yml     # Auto PyPI publish on version tags

Contributing

Contributions are welcome!

1. Fork the repo and clone it
2. uv sync to install dependencies
3. Create a branch, make changes, ensure uvx ruff check app.py transcribe.py main.py passes
4. Open a Pull Request against main

Areas where help is appreciated: streaming TTS, batch processing, audio post-processing, UI improvements, and testing.

Found a bug? Open an issue.

License

MIT

Acknowledgments

• Qwen3-TTS by Alibaba Cloud — voice cloning, custom voice, and voice design models
• OpenAI Whisper — speech recognition
• Gradio — web UI framework