Audacity Forum

It is a more than 40 years old concert recording (made with a Philips mono casette recorder) within the audiance.

I'm using Audacity 2.4.2 and have Windows 8.1

I have an old concert recording in mono. This one sounds rather dull.
I want to refresh the sound so that the recording will sound fresh and sparkling.

How do I that in Audacity, what should I do?
Which filters are useful?

pinkf