AutoChain in Ableton Live01
Load AutoChain on the bass track
Select the track that holds your bass. Open Device View by clicking the bottom section of the screen or pressing Shift+Tab. Drag AutoChain from the Browser onto the track.
02
Enable the sidechain input
On the AutoChain device under the Sidechain section, open the dropdown menu and select your kick drum track from the list. Verify you have the mode set to your intention, most typically Post FX.