Question about main room house video

hey Phil I was just watching the video where you use a side chain after the reverb on the return channel, I have mine set to the chords the way you have yours set to the mid stabs and I have it set to post fx but its not side chaining, so I am a tad confused why its not working if I sidechain it to the kick it pumps but for some reason it wont sidechain like yours is to the stabs, any help would be appreciated