Just figured something out that I’d like to share:
Plug the EP-1 Pedal to the S/H input and set the trigger LFO to a rather fast value (around 10-15Hz it think) and plug the output through an Attenuator into the LP Filter CV. It makes a “stepping filter” (much hated on digital synths due to knob quantization. Set resonance high and move the pedal. Sound kind of nice to me 
Add some delay from an FX unit for extra effect.
If you don’t have the EP-1 Pedal just use the CP-251 mixer output instead and turn the Offset knob instead of moving the pedal.
Anyone has some cool CP-251/LP combos?