Releases don't fail from bad songs as often as they fail from missed steps — the pitch window that closed, the registration that never happened. This is every step, in order, with the timing that actually matters.
Checks save on this device automatically. Use Reset when you start the next release — foundation checks stay, those are once-ever. Nothing is uploaded.
Everything in this house is free, built by one working songwriter. If something in here made you money — or saved you some — throw a buck in the jar on your way out. Musicians tip musicians.