Today I tested AllChords with the Launchpad S and can confirm that it works just fine.
The Launchpad S has the same midi implementation as the original Launchpad so no new programming was required in AllChords.
In the set up phase (refer to provided documentation) you need to make sure that MT Player selects Launchpad S. This is a one time only setup.
Once done AllChords will look for and recognise your Launchpad S.
So, its the same setup for both versions of the Launchpad. Just select your model.
See MT Player settings images below…..
For more information on AllChords see http://soundtemple.com.au/tools/allchords/