Hey! I'm one of the devs on the MicroMusic project. We're just a bunch of students so, admittedly our product isn't perfect yet but we're working on improving it every day so stay tuned for updates.
Two days ago we released a new version that should address the issue you had @audioschmaudio
The problem was we were assuming the input was a specific type of WAV file.
Feel free to join our Discord server to help us make improvements and stay up to date with the latest changes: https://discord.gg/fqkWSJzte6
Thanks for your interest!