I’ve already posted a former version of the sidechain sim a few days ago in the beginners questions.
Well, here it is again, slightly changed to make the effect more obvious (removed the reverb from the SC) and added by 6 LFO presets to simulate different sidechain responses. The LFO shapes are recreations from the sidechain curves in Steve Duda’s Xfer LFO Tool (http://www.xferrecords.com - highly recommended!). Just drop the presets into your LFO preset folder, load the .XRNS then and switch through the LFO presets.
To trigger the LFO you can use any instrument or any volume value (even 00) without any instrument. Before I forget to mention again, the LFO triggers a Gainer, so you’re still able to adjust the in and out faders of the mixer.
Tip: If you want/need to run a constantly pumping sidechain effect without need for a trigger, just connect a LFO device to a gainer, select one of the presets and unselect “one shot”. You’re still able to turn off the pumping by simply disabling the gainer with pattern commands.
The technic is actually an oldie and not my invention nor something special nowadays. Someone on the forum, I don’t remember who was it (sorry!), did something like that already a long time ago. I just posted it, because a lot of people still ask how to achieve a sidechain effect. And I think, compared to the signal-follower method the LFO variation is still the way better and more effective one. I guess the presets show why.