Why some links don't work (CORS)
Most audio servers block browsers from downloading their files via JavaScript for security reasons — even if the link opens fine in a new tab. This is called a CORS restriction.
Option 1 — Load via proxy (recommended): Routes the request through a public CORS proxy. Works for most public MP3 links.
Option 2 — Load direct: Uses the browser's native audio player. Good for playback and comparison but waveform display is limited.
Option 3 — Download & upload: Open the link in a new tab, right-click the audio player → Save As, then upload the file using the "Upload audio file" tab. This always works.