Help to fix an audio file?

An aluminium/ aluminum/kitchen foil shield may help with a 5-10mm hole in it to let the sound reach the mic.

Don’t permit the foil to touch anything metal, [If you get electrocuted sue Kozikowski it was his suggestion].

Hey what about a dud CD/DVD a shield: they’re coated with Aluminium and have a hole in the middle for a mic.