Logic Arp, need some help! Options

[Christopher Rand]

Hey
Im not a dummy but for whatever reason I cant figure out how to get the arpeggiator to work in logic pro 7. Am I just not making the right connections.
I open the environment. Click new arp, then connect it to the instrument I am playing. Then I press play(because the manual says it needs to be recording or playing to function) but nothing seems to be happening.
help please!
Im sure its something dumb Im just missing