In order to controll all of the drums outside of the Receptor, you will need to use all of the outputs. You will need to use the SPDIF outs, the Stereo outs, and the ADAT out. That will give you 12, but you will need converters. If you are using the Remote controll software that comes with Receptor. you can make the adjustments that you need with the mixer screen. You can also use a MIDI fader pack and controll the fader adjustments via MIDI. The whole idea is to keep it in the digital environment and keep the sound as clean as possible.
Hope this helps,