ComfyUI-Omnivoice

A ComfyUI custom node for OmniVoice — a massive multilingual zero-shot TTS model supporting 600+ languages.

Features

• Voice Cloning — clone any voice from a short reference audio clip
• Voice Design — describe a voice with text (e.g. "female, low pitch, british accent")
• Auto Voice — let the model pick a voice automatically
• Audiobook-ready — handles arbitrarily long text with near-constant VRAM via built-in chunking
• Multilingual — 600+ languages

Installation

1. Clone into your ComfyUI custom nodes directory:

   cd ComfyUI/custom_nodes
   git clone https://github.com/ethanfel/ComfyUI-Omnivoice.git
   

2. Install via ComfyUI Manager (recommended) — it runs install.py and requirements.txt automatically.

   Or manually:

   pip install omnivoice --no-deps
   pip install -r requirements.txt
   

   Why --no-deps for omnivoice? It pins torch==2.8.* from a CUDA 12.8 index. Installing it normally would overwrite ComfyUI's torch build. install.py handles this automatically; requirements.txt covers the remaining deps safely.

3. Restart ComfyUI. The nodes will appear under the OmniVoice category.

Nodes

OmniVoice Model Loader

Loads the OmniVoice model. Downloads automatically from HuggingFace on first run and caches locally.

Input	Type	Description
device	dropdown	cuda:0, cuda:1, or cpu
dtype	dropdown	float16, bfloat16, or float32

Downloads automatically from HuggingFace on first run and caches to ComfyUI/models/omnivoice/.

Output: OMNIVOICE_MODEL

---

OmniVoice Generate

Generates speech from text using a loaded model.

Input	Type	Description
model	OMNIVOICE_MODEL	From OmniVoice Model Loader
text	string	Text to synthesize (full pages supported)
mode	dropdown	voice_cloning, voice_design, or auto_voice
ref_audio	AUDIO	Reference audio for voice cloning (optional)
ref_text	string	Transcription of ref audio — auto-detected if blank (optional)
instruct	string	Voice description for voice design mode (optional)
speed	float	Speed multiplier — default 1.0
num_step	int	Diffusion steps — default 32 (use 16 for faster generation)

Output: AUDIO at 24kHz — connects directly to ComfyUI's Save Audio node.

Example Workflow (Audiobook)

[OmniVoice Model Loader] ─────────────────────────┐
                                                    ▼
[Load Audio (narrator clip)] ──► [OmniVoice Generate] ──► [Save Audio]
                                        ▲
                              text = "Page 1 content..."
                              mode = voice_cloning

Repeat the Generate + Save Audio nodes for each page, reusing the same loader.

Credits

• OmniVoice by k2-fsa
• OmniVoice paper