Hey guys I could understand those guys but it was hard and I had to waste too much energy doing it. That is what I mean by terrible speaking skills. Should not be that way really. People should be easy to hear and understand. Simple as that. Then no energy is wasted trying to figure out what they are saying. You can use that energy to absorb what they are in fact talking about instead.
Attack times are not so much related to the BPM of the track but related to how you want that leading transient to sound. That is why it is good to practice setting Attack times on a mix rather than a track. On a mix you will hear the attack transients being smashed a lot easier.
Release is one of those parameters that is a bit elusive and harder to set. To say it is not related to BPM is ill advice. I agree it needs to be fine tuned but the BPM is a great place to start. As we know the release time is the time taken for the compressor to recover ready to do its thing again once compression has been initiated.
So if our tune is say 120 BPM that puts each crotchet (the pulse of the music) at 500 ms. So you can always start with a 500 ms setting. If a tune has a four on the floor kick groove going on and a kick hits the compressor we know we want at least to be back to normal by the next kick so 500 ms would be a good place to start. I do agree it does need to be fine tuned more for feel then from that point on. I find multiples often work after that. 500ms might be a bit slow so try 250 ms instead. And if you don't like that try 125 ms.
When compressors are set for limiting fast release times often work better too. eg I would try 60 ms after that etc..
It does not hurt to know the time between the crotchets or pulse of your music at all. It is a very useful parameter to know. (eg delays etc..)
Mixing involves art and science. You can all carried away with the art of it and forget the science. Keep an eye on the science part too.