don't forget that sidechain is ment for one sound 2 "compress" another, so if u use individually not much should happen. As u don't have mixer tracks grouping in ableton U have 2 use a work'a'round ... either bounce the kick and bass (for instance) 2gether and the use comp II on that or use the sends 1 (as an example), bring they're track fader all the way down so u have no original sound (the sends will have 2 b post-fader), now compress the send 1 track with comp II ----- I haven't tryed but should work like a charm...

PS - use send 1 level for each sound 2 get the right balance!

Z