Open text-to-speech models have become small and fast enough to run anywhere. Piper voices run faster than real time on a laptop CPU. But when we built the text-to-speech tool on Loudness.ai, three problems stood between "it runs" and "it sounds right". loudness-tts is what we built to solve them, and it is free and open source. 1. Which voice? Piper has more than 170 voice files, some with hundreds of speakers. Their quality varies a lot, and many are licensed for non-commercial...