Why is my Audi 80's engine making a strange noise

I have noticed that my Audi 80's engine is making a strange noise whenever I accelerate. It sounds like a high-pitched whine and it started happening recently. What could be causing this and how can I fix it?

It is likely that the noise is coming from your engine's belts. They may be worn out or loose, causing them to make a squealing noise. You should have them checked and replaced if necessary by a qualified mechanic.