▷ About

VoxCPM models speech in a continuous space using a MiniCPM-4 backbone, producing highly expressive speech and accurate zero-shot voice cloning. This node handles model downloading, memory management, and audio processing end-to-end.

❖ VoxCPM2

• Voice Design — generate voices from natural language descriptions
• Controllable Voice Cloning — clone with style control instructions
• Ultimate Cloning — combine reference audio (identity) + prompt audio (prosody)
• 48kHz output, 30+ languages

❖ VoxCPM1.5

• 44.1kHz output, LoRA support, native LoRA training
• Context-aware expressive speech, zero-shot TTS
• Automatic model management

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▓ Getting Started

Via ComfyUI Manager: Search ComfyUI-VoxCPM → Install.

Manual install:

cd ComfyUI/custom_nodes/
git clone https://github.com/wildminder/ComfyUI-VoxCPM.git
cd ComfyUI-VoxCPM
pip install -r requirements.txt

Restart ComfyUI. Nodes appear under audio/tts. Models auto-download to ComfyUI/models/tts/VoxCPM/ on first use.

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▓ Models

Model	Params	Sample Rate	Languages	Link
VoxCPM2	2B	48kHz	30+	openbmb/VoxCPM2
VoxCPM1.5	800M	44.1kHz	2	openbmb/VoxCPM1.5
VoxCPM-0.5B	640M	16kHz	2	openbmb/VoxCPM-0.5B

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▓ Nodes

❖ VoxCPM TTS

Unified TTS node supporting VoxCPM1.5 and VoxCPM2: zero-shot TTS, voice design, voice cloning, ultimate cloning, LoRA support.

❖ VoxCPM Voice Cloning

Configures audio-based cloning (prompt/reference audio, VAD trimming). Connect to TTS node's voice_config input.

❖ VoxCPM Advanced Params

Configures diffusion parameters (temperature, sway sampling, CFG, timesteps, retry). Connect to TTS node's advanced_params input.

❖ Training Nodes

• VoxCPM Train Config — LoRA training parameters
• VoxCPM Dataset Maker — create training datasets from audio
• VoxCPM LoRA Trainer — train custom LoRA models

Note: voice_design is a direct parameter on the TTS node, not part of the Voice Cloning config.

Config precedence: Direct parameters > config node values > defaults.

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▓ Usage

❖ Basic TTS (Zero-Shot)

Add VoxCPM TTS → select model → enter text → generate.

❖ Voice Cloning (VoxCPM1.5 style)

Connect Load Audio → prompt_audio, provide exact transcript in prompt_text → generate.

❖ Voice Design (VoxCPM2)

Select VoxCPM2 model → enter description in voice_design (e.g., "warm female voice") → generate. Voice design is applied in plain TTS and reference cloning modes. Ignored when prompt audio is used (continuation cloning).

❖ Reference Cloning (VoxCPM2)

Connect reference audio to reference_audio (no transcript needed) → generate. Voice design instructions can be combined with reference audio for controllable cloning (e.g., style control).

❖ Ultimate Cloning (VoxCPM2)

Connect reference_audio (identity) + prompt_audio with transcript (prosody) → generate.

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▓ Advanced Parameters

❖ Diffusion

Parameter	Default	Range	Description
temperature	1.0	0.1-2.0	Lower = stable, higher = expressive
sway_sampling_coef	1.0	0.0-2.0	Sway sampling trajectory
use_cfg_zero_star	True	—	CFG-Zero* optimization
cfg_value	2.0	0.1-10.0	Guidance scale
inference_timesteps	10	1-100	More steps = higher quality, slower

❖ Device & Precision

Parameter	Default	Options	Description
device	auto	cuda, cpu, mps, xpu, npu	Inference device
dtype	auto	auto, bf16, fp16, fp32	Model precision

AudioVAE always runs in FP32 for numerical stability.

❖ VAD (VoxCPM2)

Parameter	Default	Range	Description
trim_silence	False	—	VAD silence trimming
max_silence_ms	200.0	0-1000	Max silence at boundaries (ms)
top_db	35.0	10-60	Lower = more aggressive trimming

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▓ LoRA Support

Inference: Place .safetensors LoRA files in ComfyUI/models/loras/, refresh, select in lora_name dropdown.

Training: 👉 Full LoRA Training Guide

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▓ Voice Design Examples

Description	Result
warm female voice	Soft, gentle female voice
deep male voice	Low-pitched male voice
cheerful young girl	Energetic, high-pitched
professional announcer	Clear, authoritative
whispering voice	Quiet, intimate

Combine descriptions: "warm female voice with slight British accent"

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▓ Voice Cloning Tips

1. Verbatim transcript — prompt_text must match audio word-for-word
2. Punctuation matters — affects intonation
3. 5-15 seconds of clear speech works best

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▓ Risks and Limitations

• Voice cloning can be misused for deepfakes — use responsibly
• May exhibit instability with very long/complex inputs
• VoxCPM1.5: Chinese and English only; VoxCPM2: 30+ languages

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▓ Changelog

v2.4.0

• Custom model selector UI — replaced default LiteGraph dropdown with custom DOM widget featuring cyber-themed design, SVG model icons, and DEFAULT/CUSTOM badges
• Real-time download progress — live progress bar with cancel support, Xet dedup tracking, and file-level progress
• Lazy-loaded frontend — 95% startup payload reduction; heavy JS loads only when a VoxCPM node is placed
• Model directory dialog — browse and select custom model paths via a dedicated dialog instead of queue-time prompts
• Architecture version tags — model dropdown detects and displays architecture version (v1/v2) tags
• ComfyUI settings API migration — model path settings now use ComfyUI's native settings panel
• Graceful download error handling — automatic retry on transient network errors with toast notifications
• BEM-styled UI — modern CSS architecture with design tokens for consistent theming

v2.3

• VoxCPM2 support (voice design, reference cloning, ultimate cloning, 48kHz, 30+ languages)
• Unified dtype/device handling delegating to ComfyUI
• Vite 5→8 upgrade, LiteGraph canvas widget fixes
• LoRA training nodes

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License

VoxCPM model and components: Apache-2.0 License by OpenBMB.

Acknowledgments

• OpenBMB & ModelBest for VoxCPM
• The ComfyUI team for the platform

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