well, this has explained many a times.

put a fruity peak controller on the kickdrum channel (or better a send from this kickdrum channel), if using a send leave the 'mute' button enabled, if on the kick channel itself, deselect 'mute' or you won't hear the kick. then do a right click on the volume knob of your bassline channel (or whatever channel you want to sidechain the kick to) and then
'select controller' ---> select internal controller ---> channel the peak controller is on + peak.

then as the 'mapping formula' select 'inverted'.

no use the controls in the upper part of the peak controller plugin to tailor the sidechain to your needs.


this should be made sticky, i am getting sick of explaining it, to be honest.



the following link should explain it, too:

http://www.samplecity.net/forum/show...eak+controller