Kslider has nothing to do with volume if you mean volume as in amplitude. it deals with (midi) velocity 0-127 meaning 128 steps. You can scale or mutiply or divide velocity or multiply an audio signal if your talking about amplitude. Divide left outlet of kslider by 127. to get a rage from 0. to 1. which is suitable for an audio signal.
If your talking about keyrange? look in the kslider inspector key offset
Can you please be more specific! What is that you need? If you want a (volume) slider looking like that you will need to put it in a pictctrl object. check the helpfile of pictctrl. I think you'll have to make a .pict file.
The image for the slider has two parts for the two different mousestates - if you want the image to be, say, 20*20pixels you'll need an image 20*40pixels with each half representing its clicked and unclicked image. It's explained better in the help file.