Apple Logic Pro /LogicExpress Discussion

Hi all, I can't seem to find in the manual or the menus where to affect a virtual instrument's cutoff/attack/release etc. Also when the instrument is a synth, where to choose the sound generator? 

The effects, EQ and compression options are easily found. But the items above...not so much. I just switched over to Logic, and I cannot image that Garage Band has this, but Logic does not? Hopefully I'm just missing it!

Thanks, 
Jeannie