It's surprising how ambiguous terms are for sounds, well maybe not ambiguous, maybe inexact is a better word.
Anyways, to be expected on cars that are 20+ years old, my S4 had a growing cacophony of creaks, rattles and squeaks so decided to take action.
A creaking from the footwell area was cured by lubricating a u-joint in the steering column. I lubricated all bushes in the suspension. Tightened up bolts in and around the exhaust and exhaust mounts. Tightened up the rod between turbo and exhaust manifold heat shield. Added good quality leather balm to all leather surfaces in the cabin, especially those that were in contact with other leather surfaces.
The result was startling good. No longer does she sound like a bag of spanners being dragged across a bumpy surface. Wouldn't say it's sound free, am sure seeing to the mounts where the body shell attaches to the chassis would help in addition, but more than happy with the result of this minor maintenance.
Only post this because, despite an extensive search of TLF, I didn't find an equivalent report.
If anyone has any other experience, advice or recommendation, would be happy to hear it!