How to delete this effect

How to delete this effect.

There is no track there.

Is that supposed to be a track going backwards?

Can easily be reversed in Audacity so it’s the right-way-around …
![part of ‘‘test’’ reversed in Audacity i’t’s a cover of ‘‘at last’’).wav|audio
It has unfixable problems : lots of compression-artefacts and nothing above 7KHz , as if it was played over Skype .