fast or slow compressor attack, when ?

[SLy_drums]

When do you guys use a slow/fast compressor attack ? What instruments ?
Do you use fast attack when you want transients to be heard less ?

[heathen]

A slower attack will allow transients through

[Wayne]

Originally Posted by SLy_drums

... What instruments ?

Or take a more generic approach. Think about where or what on the signal's envelope you want to change Vs the envelope's shape. Getting in and out with just a little of the top, or...
On a lot of signals 'fast (relative again) even at low ratios can grab a big chunk of it.