Add the XL SFT GGUF to the README

README.md

@@ -2,6 +2,7 @@
 license: mit
 base_model:
   - ACE-Step/acestep-v15-xl-turbo
+  - ACE-Step/acestep-v15-xl-sft
 pipeline_tag: text-to-audio
 tags:
   - gguf
@@ -16,17 +17,21 @@ GGUF conversions of music and speech models for
 [audio.cpp](https://github.com/0xShug0/audio.cpp), the ggml-based native audio
 inference framework.
 
-## ACE-Step 1.5 XL Turbo (bf16)
+## ACE-Step 1.5 XL (bf16)
 
-`ACE-Step1.5-GGUF/xl-turbo/ace-step-1.5-xl-turbo-bf16.gguf` — 14.2 GB.
+| File | Size | Package | Upstream |
+|---|---:|---|---|
+| `ACE-Step1.5-GGUF/xl-turbo/ace-step-1.5-xl-turbo-bf16.gguf` | 14.2 GB | `ace_step_xl_turbo_bf16` | [acestep-v15-xl-turbo](https://huggingface.co/ACE-Step/acestep-v15-xl-turbo) |
+| `ACE-Step1.5-GGUF/xl-sft/ace-step-1.5-xl-sft-bf16.gguf` | 14.2 GB | `ace_step_xl_sft_bf16` | [acestep-v15-xl-sft](https://huggingface.co/ACE-Step/acestep-v15-xl-sft) |
 
 The XL DiT is the larger ACE-Step 1.5 transformer: 32 layers of 2560 against
-turbo's 24 of 2048, with 32 attention heads of 128. The file is self-contained
+turbo's 24 of 2048, with 32 attention heads of 128. Each file is self-contained
 the way audio.cpp's other ACE-Step GGUFs are — XL DiT, planner LM, text encoder
-and VAE in one file — so it needs no other download.
+and VAE in one file — so neither needs another download.
 
-Converted from [ACE-Step/acestep-v15-xl-turbo](https://huggingface.co/ACE-Step/acestep-v15-xl-turbo)
-(float32 upstream) with `audiocpp_gguf --type bf16`.
+XL Turbo is guidance-distilled and ignores `guidance_scale`; XL SFT takes the
+CFG path. Both were converted from the float32 upstream snapshots with
+`audiocpp_gguf --type bf16`.
 
 ### Install
 
@@ -45,7 +50,8 @@ audiocpp_cli --task gen --family ace_step --model models/ACE-Step1.5-GGUF/xl-tur
   --load-option ace_step.dit_model_path=acestep-v15-xl-turbo --out song.wav
 ```
 
-Measured on an RTX 5090 (CUDA), 20 s of audio in 15 s including model load.
+Measured on an RTX 5090 (CUDA), 20 s of audio in 15 s including model load,
+either variant.
 
 XL support landed in audio.cpp via
 [PR #235](https://github.com/0xShug0/audio.cpp/pull/235); see