# ACE Step1.5XL_TurboSFT_Merge_50-50 – Multi-Format (FP16 / FP8 / NVFP4)

Welcome to this repository! Here you will find a merged model of  **ACE-Step 1.5 XL Turbo** and **ACE-Step 1.5 XL SFT** audio model in various quantization formats, optimized for different VRAM requirements—especially for use in **ComfyUI**.

## 📌 Original Model & Credits
This repository is a repack/merge based on the fantastic work of the ACE-Step team. 
Please visit and support the original creators here:
👉 **[Original ACE-Step 1.5 XL Collection](https://huggingface.co/collections/ACE-Step/ace-step-15-xl)**

Example for Settings:

![image](https://cdn-uploads.huggingface.co/production/uploads/65fb4a3fbeb503364b5ecfa6/hPehvQJMrS5bpubJ5Q07t.png)

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## 📂 Available Formats
Choose the format that best fits your hardware:

### 1. FP16 (16-Bit Half Precision)
* **File Extension:** `.safetensors` (or marked accordingly)
* **Description:** The uncompressed version. Offers the absolute highest audio quality but also requires the most VRAM. Ideal for high-end GPUs.

### 2. FP8 (8-Bit Quantization)
* **File Extension:** `*fp8.safetensors`
* **Description:** The perfect sweet spot. Halves the VRAM requirement compared to FP16 while keeping the audio quality nearly identical to the original. Highly recommended for most users.

### 3. NVFP4 (4-Bit Quantization) 🚀
* **File Extension:** `*nvfp4.safetensors`
* **Description:** An extremely compressed version for minimal VRAM usage. 
* **Important Technical Note:** Converting DiT audio models to 4-bit is highly experimental. To preserve audio quality and completely prevent the `Input tensor must be contiguous` crash in ComfyUI, critical sensitive layers (such as `bias`, `norm`, `embed_tokens`, `timbre_encoder`, `project_in`, and `quantizer`) were **not** quantized and intentionally left in `bfloat16`. Only the heavy Transformer blocks run in 4-bit. This makes the model **stable and ready to use**.

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## 🛠️ Usage in ComfyUI
1. Download your desired format (FP16, FP8, or NVFP4).
2. Place the file in your ComfyUI directory under `models/diffusion_models` (or the specific folder required by your audio node).
3. Load the model using your standard Model Loader Node.

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*Hosted by [Starnodes](https://huggingface.co/Starnodes/AceStepXL_Merge/)*