How to use buttons on your original Launchpad to control sliders and cross-faders in Ableton Live

Step 1: Choose the slider you want to control

Step 2: Select USER 2 mode on Launchpad

Step 3: Select MIDI learn mode in Ableton

Step 4: Click the parameter you want to control with your mouse (i.e. crossfader)

Step 5: Push the first and last buttons of the range you want to assign the parameter to on your Lanchpad

Step 6: Now those buttons are controlling the cross fader in 9 steps (i.e. 9 buttons)