You could do that with the Analog Heat, couldn’t you? I haven’t tested it, but I think you could take take the kick (or whatever) into the expression input and map that to either the full volume or the high pass freq. I would have probably already tried this, but I want my kick to go through the heat too, which would be stupid in this scenario.
Unfortunately the Heat is way too big for the space I have left in my rig. It’s on the list to get someday but the price is also a bit out of my range too.
I just got a message from him. SC audio routed to output is not possible, not a deal breaker though.
Still waiting to hear about availability, though need to sell some stuff first.
FWIW, I’ve had this comp for years on a pedal board that I use primarily for electric bass (but also works great for guitar):
https://www.fealabs.com/products/opti-fet/
It didn’t seem to like line-level all that well when I tried it, but if you have a reamping option (like this, which I have), it works great.
EDIT: I should mention that I have barely tried the sidechain capability, so I can’t speak to it very well, but it’s a handy option in a nice compact package.
Looks like s beast! But I need stereo for my setup. Looks pretty killer for my guitar rig though. I currently run an Analogman Bi comp in front snd an Aphex optical comp on the end. Sounds great but not a lot of flexibility.
alesis nanocompressor! its about as wide as the text comment box, stereo in/out, sidechain

this one?
What about an FMR RNLA so you have a couple flavors to choose from?
OTO Boum 
2hp has one coming up (see bottom of page).
can’t get much smaller than this 
Do any of these recommended compressors let the sidechain input pass through to the output? So I don’t need to split the kick into two channels
Uh sorry, @Lieder asked the same question. Still stands tho 
I think Suonobuono nABC is the winner here for me. It’s more than I wanted to spend but it has stuff I didn’t know I wanted until xidnpniss put it on my radar; thank you!!
I’m in touch with them and hope to place an order soon, just need to sell some things to make it happen.
I appreciate all the help very much.
You won’t regret it , it’s the best bang for the buck for solidity/praticity/portability and playability
You gonna love to use it with Digitakt for midi ducking , aswell working well as any compressor 
Was nABC already mentioned?
Edit: yes it was ![]()
Haven’t read through
Hey man, any chance you have an Octatrack??
I got the nABC today. I set it all up and for some crazy reason it acts crazy when sequenced from OT (extremely uneven, jerky response from all parameters) I spent three hours swapping cables, changing setting, etc…
just when I finally decided the nABC was messed up, I tried it with a regular midi controller and both the Digitone and Digitakt AND IT WORKS GREAT!
Even stranger is the Octatrack works perfectly fine with every other piece of gear in my studio.
I about lost my mind today 
The only thing between the OT and nABC is a Erica Synths midi splitter
My rig is so tight I haven’t tried removing that yet but nothing else has an issue with it.
@Lieder Let me check connection directly will report back
Got my iconnectivity mio4 between OT and nABC
…
Yes
You are right, haven’t tried myself :but OT directly connected using midi sidesmcahin NOT working

Using another midi device between there are no problems … Aaaaaah!
MK2 version of OT…
alright, I contacted Stefano about the MIDI issue - waiting for reply 
was not aware of this - which makes it nessecary to run it via another MIDI device…
This is so strange. I contacted him too. I’m totally confused how this would be possible.
Thank you for checky.