Ok, so I'm trying to freeze the sound of a sample so I can use it as a riser for a build-up (and it seems like a handy skill for a lot of different examples), but I can't seem to get it to work.

I'm using Logic Pro 9, and watched this Logic Pro X tutorial (hoped it would work the same, but it doesn't):

I have the sample set up to send to bus 3. I've put the volume at 0dB. I've inserted the EVOC20 on a new channel and drawn a region. I've set the sidechain on the EVOC20 to bus 3. I've drawn in the automation and copied it like it shows in the video. But I still can't get the freeze fx

Can someone please help me with this and explain to me why it isn't working now and how I can do this trick

Thanks sincerely!