Located at the output of the two independent sound layers, the effects page contains two Expressive FX slots, as well as a Stereo Delay and a Plate Reverb as master effects. Additionally, an Expression module with two Expression controls serves as a convenient source for modulations.
 

fx expression controls

These two knobs are used as modulations signals dedicated to parameters on the effects page. Similarly to the main expression module within the synth layers, you can map these two controls to a MIDI controller or automate them via your DAW.