I am looking for some advice on audio restoration. I have recently purchased a couple of old live recordings on CD where some noise reduction tool has clearly been used on the original files. There is no evidence of the trademark high-pitched jingling sounds, but rather just a noticeable thinness to the sound and lack of high frequency content above about 5 or 6kHz. I am going to try and EQ this manually but does anyone know of any clever plug-in tool that aims to replace/imitate what has been over-zealously taken away?