I found some cool freewaretools to simplify sidechain-routings for hosts which are not supporting 4/2-plugins such as cubendo. they are surely of interest at least for some of you
first, there is vstboard, which is also avalable in 64bit but not osx. osx users may look at vstforx.
second, there is wormhole2. this is 32bit only, but works perfectly with jbridge. osx is also avalable.
now, you may get it already where this is going ;D
load vstboard where you would load the nebula-compressor normally, load nebula and wormhole2 inside vstboard, route the normal audiopath, route the wormhole-output to sidechain-input of nebula, load a second instance of wormhole2 to the desired sidechain-source, setup wormhole2 to find each other, done.
if this work for you, you can save the vstboard-setup as a preset, so there is really minimal effort to setup a sidechain-routing once saved such a preset!!
i didn't test vstforx, but at least vstboard does well! check it yourself. both are freeware, vstboard is opensource.
what i'm not sure, is if wormhole2 is setting its latency according to its transmission-latency, but theoreticly it should. i didn't hear some delay, but its more difficult to hear if it acts just as sidechain input. at least it sounded awsome ;D
what's also possible to create a pumpin beat without wormhole2, is to load a drummachine directly into vstboard where thisone triggers the sidechain in sync to the host. i tried this with xfer nerve and it worked perfectly. i also built a 2band-sidechain setup compared to the vengeance multiband-sidechain effect. there the fun really starts!! ;D