you can change the size of the influence too by holding down b and middle mouse button dragging
(middle mouse button dragging is a virtual slider bar that you can use with a lot of things. like in the channel box if you select an attribute with a number and middle mouse button drag anywhere in your scene it will change)
that's a "Ch" pronounced as a "K"
Computer skills I should have:
Maya, XSI, Photoshop, AfterEffects, Motion, Illustrator, Flash, Swift3D