so i'm looking at a cheap, but satisfactory, pitch shifting pedal that can do whammy effects like the RATM "killing in the name of" solo and radiohead "airbag" madness. i've noticed that the EHX holy stain has pitch shifting and an expression pedal input. if i plug an expression pedal in and put it in pitch shift mode can it emulate those sounds? i've read rumours that it can, but no real evidence. anyone?