[Feature Request]: Add more basic audio templates

### Description

Add more templates for basic audio processing. Currently there is only a single template or example workflow.

E.g., add template for audio 2 audio, which is just a slight adjustment to the text 2 audio template.

### Additional information

_No response_

Start by locating the existing text-to-audio template or example workflow referenced in the issue and review how the repository organizes templates. Add an audio-to-audio template and any other agreed basic audio templates, then verify that the resulting workflows load correctly.

Written by the indexing model from the issue text.