Building Dynamic Audio with Emotion & Pace: Gemini 3.1 Flash TTS, Angular & Firebase Cloud Functions [GDE]

Google released the Gemini 3.1 Flash TTS Preview model for AI audio generation in the Gemini API, Gemini in Vertex AI, and Gemini AI Studio. This model introduces a new Audio tags feature to exhibit expressive human emotion, pace, and style. This application explores Firebase AI Logic to analyze an uploaded image to generate recommendations, description, alternative tags, and an obscure fact. The obscure fact is sent to a Firebase Cloud Function to generate an audio using a Gemini TTS model. The