The problem is that I have to take my unit out from the studio to check the mods. My attack and release values where choosen by carefull listening.
As I said, I did no used the schem posted in this thread. I ended using a pot (as a reostat) for the attack, and a switch for both release resistors (2 pole, six position if I recall). Of course, I should have taken notes, but what can I do now?... :?