ChatterboxTurboTTS fails with RuntimeError: expected scalar type Double but found Float when specifying audio_prompt_path when numpy>=2.0

[felixgwilliams]

When running the following code, I get an error due to a mismatch between float types

tts_model = ChatterboxTurboTTS.from_pretrained(device="cuda")

text = "Whereas recognition of the inherent dignity and of the equal and inalienable rights..."
wav = tts_model.generate(
    text,
    audio_prompt_path="voice_example.wav",
)

I am running this on python 3.13, so I have numpy>2.4.4 installed. I think the issue is in

chatterbox/src/chatterbox/tts_turbo.py

Line 211 in 59bc590

wav = wav * gain_linear

gain_linear is a np.float64 and due to the new type promotion rules, this promotes wav from an np.float32 to a np.float64.

In my use case, it's good enough to cast gain_linear to np.float32, but there may be more places where promotions happen.

I'll raise a pull request.