sidechain compression in garageband?

are there any plugins that allow this in garageband?

for those that don't know side chaining is when you route the bass of a track into some audio effect of another track (usually the compressor). it creates a nice resonating effect in time with the beat.

ive seen a youtube video of someone claiming to sidechain in garageband but all he did was set up repeating volume automation in time with the kick drums 🙂

thanks