Hello Rafael,
Do either of Hauptwerk's 'audio CPU' or 'audio level' meters on the 'Audio, MIDI and Performance' control panel ('View | Large floating control panels ...') go into the red when the noises occur?
If not, does turning the audio level down a little on that control panel, and/or on your amplifier, eliminate it anyway?
However, if body movements or touching the console wood affect it, then my guess would be that there is some kind of electrical interference issue, or a grounding issue, or similar wiring issue.