We’ve just launched a small, but sometimes very useful feature on SoundCloud. It’s a new button on the edit-pages tracks that says “Replace this audio file”. Clicking it will bring up a file picker just like you would expect, so that you can upload a new version of a file you already uploaded. Very handy if you discover a glitch in the file you uploaded, or maybe you found that uncompressed version of a track you previously only uploaded in mp3 format.
The timed comments will stay at the same position as they did before, so keep this in mind and avoid uploading tracks with a different length. Replacing a track does not count as a file upload and won’t reduce your upload quota.