Ableton midi/keyboard shortcut looping control.. help!

Hi all,



I basically want to be able to emulate something i can so easily do in traktor pro and i can actually do using the mouse and keyboard in ableton, i just want to be able to do it from the midi controller.



I want to step a - assign a midi button to start loop, loop length 4 beats

step b - select loop brace (can only seem to be able to do this with mouse)

step c - do the same as apple-Arrow keys (i.e change loop length in beats, or double / half it)

step d- release loop to back to play



This seems such a standard Dj trick, i cant see how it can be so hard to do so i must be missing something!



Help!



regards



Z.c