"Hi HN, I'm Mario, a full-stack developer. I built this 100% free, no-install web tool (using Python/FastAPI and FFmpeg) to simplify professional audio tasks for creators and small teams. I was frustrated by expensive, clunky desktop apps, so I focused on advanced features like a seamless multitrack mixer with crossfades, universal video-to-audio extraction (from URLs like YouTube), and robust conversion for challenging formats like WhatsApp OPUS/AMR. It's designed for efficiency in fast-paced production environments. Happy to answer any questions!"