I want to change the mix of a Niestandardowy podkład MP3

To change the mix of a Niestandardowy podkład MP3 :

1. Login and go toMoje pliki
2. Click on "Zmiana" next to the titles you want to modify. A window should appear with a preview.
3. Customize your title at will and click on the button "Pobierz" when you are done.

This will generate a new version that will automatically download (this may take a few minutes, please be patient).