Precompiled binaries can be found here (needs at least Pd version 0.56):
https://github.com/rabbitControl/pure-rabbit/releases
The external can also be found using deken: search for “rcp”, “rabbit” or “RabbitControl”
Please find the source-code of the addon here:
https://github.com/rabbitControl/pure-rabbit
Use a app to control exposed parameters.