What INSTRUMENT plays the sound on this clip? MkBass1?

[vinitchi]

Ok, sort of a newbie question, but this is driving me insane... Sorry if it's too basic.

New to Ableton here:

I just installed Live 8, and am exploring some of the clips that came with factory content.

I went to Clips--Construction Kits---Massive Decay--Midi 6--- Mk1 Bass 1.

So I put the MkBass1 Clip in the Session View. Looking at the Device section, I see the Clip, and the notes, and midi map. But what is being "midied"? What is inside the clip? An audio file? How does it produce the sound?

Scrolling around I also found a preset called Kit Pitchy(Operator) with various clips... Does the name mean those were sounds made in Operator, saved, and now grouped together in a clip?

Sort of confused here, because I wanna understand, for instance, how I would get the Mk Bass 1 clip and create my own preset of an Electric Piano. What INSTRUMENT is playing the clip?

[vinitchi]

No one?

[dentaku]

The clips named MkBass1 seem to be made with an instrument named Jazzmaster.
You can find it in the Browser under Instruments/Instrument Rack/Piano and Keys/Custom Electric Pianos/Keys-Jazzmaster.adb
Jazzmaster is actually made by layering an Analog and a Electric together