You don’t need expensive software for basic PDF tasks. In fact, all you need is a handful of free web-based apps.

I don't want to rain on your parade here, but it sounds like anything but "very basic audio editing". That said, you can try iZotope RX, specifically the De-Clip module. It's not cheap, but you ought ...

This editor is proof that software doesn't need a gym membership to be powerful.

Photo-editing can be a chore, but there are plenty of apps available for Android that will let you quickly make your pictures ...