Update README.md

README.md

@@ -22,6 +22,6 @@ pip install mlx-audio
 ```
 
 ```bash
-python -m mlx_audio.tts.generate --model mlx-community/orpheus-3b-0.1-pretrained-bf16 --text "Hello world" --voice tara --temperature 0.6 --audio_format mp3```
+python -m mlx_audio.tts.generate --model mlx-community/orpheus-3b-0.1-pretrained-6bit --text "Hello world" --voice tara --temperature 0.6 --audio_format mp3```
 
 ```