[chuck-users] Assigning tasks to keys

Hey All, In the theme of the "key organ" example patch, I'm wondering how to assign more varied tasks to my keyboard. Rather than give the keyboard a midi-type of access to scales, I'd like to have different keys control different aspects of loops, such as sample rate control (or if "r" could increase the reverb on a loop while it's in action). Please let me know if you have any advice on this one... Thanks! Tim