Map to Siblings
Ableton Live has some nifty features hidden away, which can be easily unlocked by creating an ‘Options.txt’ file which unlocks specific features in Live. Detailed instructions on how to do this can be found here Options.txt
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There are currently around 12  additional features that can be unlocked and one of the most useful  is ‘Map to Siblings’. To enable this feature create an Options.txt file as per the instructions above and place it in the correct location (This will mostly depend on your operating system). Once you have done that add the following text to the text file on a new line -EnableMapToSiblings=1. Once you have done this, save the file and start Ableton Live.

Now for a bit of background on what the 'Map to Siblings' functionality actually does. Basically it allows us to copy parameters and macro mappings to all of the simpler devices within a Drum Rack. This might seem trivial at first, but given a single drum rack can house up to 128 seperate samples, it can be extremely time consuming going through each sample to assign macro's and adjust parameters when creating a complex rack.

This is an extremely useful feature, that can save you a lot of time when setting up custom Drum Racks.

Drum Rack Return Chains
Many Live users don't realise that drum racks have there own built in sends and return track chains. This allows us to setup a number of return tracks within our drum racks and send any sound within the rack to them. It is also possible to use the return chains to send out to the main return tracks in our session. This can be really useful for some mixing applications.

To start setting up return tracks within a drum rack, we first need to show the ‘Return Chains’. Then if we would like to send the signal out of the rack to our main return channels, we also need to show the I/Os. These can all be shown and hidden, using the icons in the bottom left hand corner of the drum rack device (Highlighted by the red rectangle below) (These won't be available unless you have selected 'Show Chains'). We then have two options; we can either drop audio effect devices onto the return chain section (Highlighted by the blue rectangle), or alternatively right click in this area and select the 'Create Return Chain' option. The latter option will create an empty return chain.

Once we have create an empty return chain, we can then use the I/O's to route it to our main return tracks in our Live session. This is shown below.

If you have a template session setup in Live, you could set this routing behaviour up as the default for all new Drum Rack's. Once we have setup our return chains in a Drum Rack, we can access the sends either in the rack or on our mixer in session view, by expanding the Drum Rack's chains.  Both approaches are shown below.

Use the buttons in the red rectangle to display the send and return controls/sections. Drop effects into the section highlighted by the blue rectangle to add effects and create return chains.