Or at least quieter while the key is pressed and then much louder after you let it go. I did this on accident once and it helped to play particular parts of a sample without having to make a clone with a different start point. Unfortunately I lost the project I did it on so I can't see what effect chain or envelope I put
Hi,
First of all, I don't get why you need this, but okay.
What you do is you put max release or reverb with lots of decay on your instrument, when the key is pressed, automate the volume of the instrument to be 0, when the key is not pressed, automate the volume to be more than 0.
Hope I helped.