Look at Options-->MIDI, and add as many MIDI events to the MIDI-mapping list as you want. Spend a little time with the MIDI mappings so that you are comfortable adding and configuring each MIDI event in the list (or that you add to it). It's helpful to transmit the MIDI events you want to use from your MIDI device to Pianoteq (by pressing keys or buttons on the MIDI hardware device (like a digital keyboard), moving a knob or wheel, etc.), so that you can see exactly what data your keyboard or other MIDI device is transmitting, in the MIDI events list just above the MIDI-mapping list in Options-->MIDI