Step-Audio-EditX — MLX 4-bit

Self-contained affine 4-bit MLX bundle of Step-Audio-EditX for Apple Silicon.

This is not the CUDA/vLLM checkpoint stepfun-ai/Step-Audio-EditX-AWQ-4bit. Load it with mlx-speech.

Converted from appautomaton/step-audio-editx-8bit-mlx using MLX affine quantization (bits=4, group_size=64, mode=affine).

Component	Precision
Step1 LM, flow-model, VQ02	affine int4
VQ06, HiFT, CampPlus, flow conditioner	bf16 (unchanged)

Total size ≈ 2.53 GB (upstream int8 ≈ 4.4 GB).

Use

pip install mlx-speech
hf download kingfang008/step-audio-editx-4bit-mlx --local-dir ./step-audio-editx-4bit-mlx

mlx-speech tts \
  --model ./step-audio-editx-4bit-mlx \
  --reference-audio reference.wav \
  --reference-text "Transcript of the reference audio." \
  --text "New cloned speech." \
  -o output.wav

Requires an Apple Silicon Mac (M1 or later).

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Safetensors

Model size

0.6B params

Tensor type

U32

BF16

MLX

Hardware compatibility

Quantized

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