See the seed before you render

Just above the Render button, a small readout shows what the current form will produce before you render it: the number of chords (Chords), the total length (Duration) and the estimated file size (Est. size). It updates as you type, so a runaway seed — a long chart times many loops can run to minutes of audio — is visible up front instead of surfacing as a long freeze.

It's also a safety check. If the time signature can't be read, or the progression contains a chord the app doesn't recognise, the readout says so and the Render seed button stays disabled until you fix it — so you never start a render that was going to fail. While a render is running, the button shows its stage, first "Rendering audio…" and then "Saving…", so you can see it's working rather than frozen.