holy s*** I think I just found a solution for this:
In order to use side-chaining, you need to enable the “3 Outputs / 1 Input” mode in Virus Control’s settings first. Please note that once this mode is enabled, the Virus cannot double as a soundcard anymore.
1. Go to the patch/utility tab in your Virus Control settings and set it to "3 outputs / 1 input".
2. go to the common page for the Virus TI track and set the main out to USB2 or USB3 L + R or whatever your preference is.
3. Add an audio channel in ableton and select "Virus TI" for "Audio From" and 3/4 or 5/6 depending on your preference for channel.
4. Now you are going to be able to add whatever fx you need to this audio channel and its coming straight out of the Virus into your audio track.
the only thing is that you can only do it for two tracks but it works for me as long as I can sidechain the bass.
Let me know if it works.