For a while now, I've wanted to do this in Sonar. Basically, I want to send a pre-fader copy of a track to another track, rather than using a bus. Normally I used this for an extra snap on a kick drum or snare, or grit on a bass. So I would create a bus called "Kick snap" or something and send the kick track (pre-fader) to the new bus. Then affect the bus as needed, and set the fader usually a lot lower than the main track.
Problems have been 1) the fader for the bus kick is way over in the console view, far away from the original kick track, and 2) if I solo anything else, the bus kick can still be heard, and I have to mute the bus. I think if it were a track, it would be muted by the solo.
So I tried Ludwig's technique, made a new audio track with the sonitus gate inserted as a sidechain output. Then send the original track to the gate sidechain (pre-fader) and nothing comes out. The gate shows no input or output signal, and the track shows no activity.
What did I do wrong? If I send to a bus, the signal goes through. But with this sidechain technique, nothing.
I'm using X2 Producer FWIW.