Great thread. Not obscure but this popped to mind.
In a drum rack, to use your set's send effects on an individual drum hit rather than the ones in the rack itself, drag and drop a utility as a send effect in the rack. That will let you use "Audio To" in that chain on the rack to route just that hit in the drum rack to the set send track without effecting the audio.
Speaking of utility. This tip is also cool. How to Mid/Side anything:
Grab a Utility device from the Live Library and apply it to the track you wish to process. Now right‑click on the Utility’s header and select Group. This will put the Utility device inside an Audio Effect Rack. Click the Show/hide Chain button to show the Rack’s chains, and then duplicate the existing chain by right‑clicking on its name and selecting Duplicate (or Ctrl-D/Cmd-D). Name one chain ‘Mid’ and the other chain ‘Sides’. Now select the Mid chain and set the Utility device’s Width to zero percent, then set the same parameter on the Sides chain to 200 percent.
What you have now are two chains working in parallel, one providing the ‘sum’ and one providing the ‘difference’. Note that this is not M/S as such, as both are still stereo chains — as before, what you have are the Mid and Sides channels separately decoded to L/R stereo, which means that the Sides chain contains the same signal in the left and right channels, but in opposite polarity.
( from http://www.soundonsound.com/sos/mar11/a ... h-0311.htm