text_encoder ([`~transformers.ClapModel`]):
First frozen text-encoder. AudioLDM2 uses the joint audio-text embedding model
[CLAP](https://huggingface.co/docs/transformers/model_doc/clap#transformers.CLAPTextModelWithProjection),
specifically the [laion/clap-htsat-unfused](https://huggingface.co/laion/clap-htsat-unfused) variant. The
text branch is used to encode the text prompt to a prompt embedding. The full audio-text model is used to