Connect the MIDI keyboard to your computer using its included cable. Power on the MIDI keyboard, if necessary. Turn all the keyboard's knobs and faders to their lowest possible settings.
Double-click the Ableton Live 8 icon on the desktop to start the program. Click "Options," then "Preferences." Click the "MIDI Sync" tab to open it.
Click the first drop-down menu in the "Input" column. Click the name of your MIDI keyboard, or the name of the MIDI port it's using, in the menu that opens. Click the first drop-down menu under "Output" and select the keyboard.
Click the buttons next to the MIDI keyboard or port's name in the "Track" and "Remote" columns to turn them on. Click the "Takeover Mode" drop-down menu and select "Value Scaling." Close the "Preferences" window.
Click the "MIDI" button in the top-right corner of the Ableton screen to turn on MIDI mapping mode. Ableton highlights all of its MIDI-controllable elements in blue.
Click on a control that you want to connect to the MIDI keyboard. Move the corresponding control on the keyboard. Repeat the process for every Ableton control you want to connect to the keyboard. Click the "MIDI" button again to turn off mapping mode and apply the configuration.