MIDI notes from GuitarPro trigger Articulation switches in Electric Bass

I’m not a bass player but the eBass is already a five string bass with the G-D-A-E and “low B” string, which equals B0 and is to my knowledge the deepest tone you can puzzle out of a “real” bassguitar normally. So the articulation controls (G0 and below) are already in an area where normally no sound should/can be played. So why does GuitarPro produce such deep notes that are inaudible normally?
best regards
Gerrit