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supertonic/.gitignore

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+window.json
+filter_bank.json
+style_extractor.onnx
+*.yml
+*.npy

supertonic/LICENSE

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+BigScience Open RAIL-M License
+dated August 18, 2022
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+Attachment A
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+Use Restrictions
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+arbitrarily-targeted use).

supertonic/README.md

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+---
+license: openrail
+language:
+    - en
+    - ko
+    - es
+    - pt
+    - fr
+pipeline_tag: text-to-speech
+tags:
+    - text-to-speech
+    - speech-synthesis
+    - tts
+    - onnx
+library_name: supertonic
+---
+
+# Supertonic 2 — Lightning Fast, On-Device TTS, Multilingual TTS
+
+![Supertonic Preview](img/supertonic_preview_0.1.jpg)
+
+<p align="center">
+  <a href="https://huggingface.co/spaces/Supertone/supertonic-2"><img src="https://img.shields.io/badge/🤗_Demo-Hugging_Face-yellow?style=for-the-badge" alt="Demo"></a>
+  <a href="https://github.com/supertone-inc/supertonic"><img src="https://img.shields.io/badge/💻_Code-GitHub-black?style=for-the-badge&logo=github" alt="Code"></a>
+</p>
+
+**Supertonic** is a lightning-fast, on-device text-to-speech system designed for **extreme performance** with minimal computational overhead. Powered by ONNX Runtime, it runs entirely on your device—no cloud, no API calls, no privacy concerns.
+
+## What's New in Supertonic 2
+
+**Supertonic 2** extends multilingual capabilities while maintaining the same inference speed and efficiency as the original.
+
+### 🌍 Multilingual Support
+
+| Language | Code |
+|----------|------|
+| English | `en` |
+| Korean | `ko` |
+| Spanish | `es` |
+| Portuguese | `pt` |
+| French | `fr` |
+
+### ⚡ Same Speed, More Languages
+
+- **No speed degradation**: Supertonic 2 delivers the same ultra-fast inference speed as the original—up to **167× faster than real-time**
+- **Efficient architecture**: Only **66M parameters**, optimized for on-device deployment
+- **Cross-language consistency**: All supported languages share the same model architecture and inference pipeline
+
+## Performance
+
+We evaluated Supertonic's performance (with 2 inference steps) using two key metrics across input texts of varying lengths: Short (59 chars), Mid (152 chars), and Long (266 chars).
+
+**Metrics:**
+- **Characters per Second**: Measures throughput by dividing the number of input characters by the time required to generate audio. Higher is better.
+- **Real-time Factor (RTF)**: Measures the time taken to synthesize audio relative to its duration. Lower is better (e.g., RTF of 0.1 means it takes 0.1 seconds to generate one second of audio).
+
+### Characters per Second
+| System | Short (59 chars) | Mid (152 chars) | Long (266 chars) |
+|--------|-----------------|----------------|-----------------|
+| **Supertonic** (M4 pro - CPU) | 912 | 1048 | 1263 |
+| **Supertonic** (M4 pro - WebGPU) | 996 | 1801 | 2509 |
+| **Supertonic** (RTX4090) | 2615 | 6548 | 12164 |
+| `API` [ElevenLabs Flash v2.5](https://elevenlabs.io/docs/api-reference/text-to-speech/convert) | 144 | 209 | 287 |
+| `API` [OpenAI TTS-1](https://platform.openai.com/docs/guides/text-to-speech) | 37 | 55 | 82 |
+| `API` [Gemini 2.5 Flash TTS](https://ai.google.dev/gemini-api/docs/speech-generation) | 12 | 18 | 24 |
+| `API` [Supertone Sona speech 1](https://docs.supertoneapi.com/en/api-reference/endpoints/text-to-speech) | 38 | 64 | 92 |
+| `Open` [Kokoro](https://github.com/hexgrad/kokoro/) | 104 | 107 | 117 |
+| `Open` [NeuTTS Air](https://github.com/neuphonic/neutts-air) | 37 | 42 | 47 |
+
+> **Notes:**  
+> `API` = Cloud-based API services (measured from Seoul)  
+> `Open` = Open-source models  
+> Supertonic (M4 pro - CPU) and (M4 pro - WebGPU): Tested with ONNX  
+> Supertonic (RTX4090): Tested with PyTorch model  
+> Kokoro: Tested on M4 Pro CPU with ONNX  
+> NeuTTS Air: Tested on M4 Pro CPU with Q8-GGUF
+
+### Real-time Factor
+
+| System | Short (59 chars) | Mid (152 chars) | Long (266 chars) |
+|--------|-----------------|----------------|-----------------|
+| **Supertonic** (M4 pro - CPU) | 0.015 | 0.013 | 0.012 |
+| **Supertonic** (M4 pro - WebGPU) | 0.014 | 0.007 | 0.006 |
+| **Supertonic** (RTX4090) | 0.005 | 0.002 | 0.001 |
+| `API` [ElevenLabs Flash v2.5](https://elevenlabs.io/docs/api-reference/text-to-speech/convert) | 0.133 | 0.077 | 0.057 |
+| `API` [OpenAI TTS-1](https://platform.openai.com/docs/guides/text-to-speech) | 0.471 | 0.302 | 0.201 |
+| `API` [Gemini 2.5 Flash TTS](https://ai.google.dev/gemini-api/docs/speech-generation) | 1.060 | 0.673 | 0.541 |
+| `API` [Supertone Sona speech 1](https://docs.supertoneapi.com/en/api-reference/endpoints/text-to-speech) | 0.372 | 0.206 | 0.163 |
+| `Open` [Kokoro](https://github.com/hexgrad/kokoro/) | 0.144 | 0.124 | 0.126 |
+| `Open` [NeuTTS Air](https://github.com/neuphonic/neutts-air) | 0.390 | 0.338 | 0.343 |
+
+<details>
+<summary><b>Additional Performance Data (5-step inference)</b></summary>
+
+<br>
+
+**Characters per Second (5-step)**
+
+| System | Short (59 chars) | Mid (152 chars) | Long (266 chars) |
+|--------|-----------------|----------------|-----------------|
+| **Supertonic** (M4 pro - CPU) | 596 | 691 | 850 |
+| **Supertonic** (M4 pro - WebGPU) | 570 | 1118 | 1546 |
+| **Supertonic** (RTX4090) | 1286 | 3757 | 6242 |
+
+**Real-time Factor (5-step)**
+
+| System | Short (59 chars) | Mid (152 chars) | Long (266 chars) |
+|--------|-----------------|----------------|-----------------|
+| **Supertonic** (M4 pro - CPU) | 0.023 | 0.019 | 0.018 |
+| **Supertonic** (M4 pro - WebGPU) | 0.024 | 0.012 | 0.010 |
+| **Supertonic** (RTX4090) | 0.011 | 0.004 | 0.002 |
+
+</details>
+
+## License
+
+This project’s sample code is released under the MIT License. - see the [LICENSE](https://github.com/supertone-inc/supertonic?tab=MIT-1-ov-file) for details.
+
+The accompanying model is released under the OpenRAIL-M License. - see the [LICENSE](https://huggingface.co/Supertone/supertonic-2/blob/main/LICENSE) file for details.
+
+This model was trained using PyTorch, which is licensed under the BSD 3-Clause License but is not redistributed with this project. - see the [LICENSE](https://docs.pytorch.org/FBGEMM/general/License.html) for details.
+
+Copyright (c) 2026 Supertone Inc.

supertonic/config.json

@@ -0,0 +1,5 @@
+{
+  "model_name": "Supertonic 2",
+  "model_type": "onnx",
+  "description": "This is a stub config for Hugging Face download counting. The actual model is located at onnx/"
+}

supertonic/model_manifest.json

@@ -1,134 +1,182 @@
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