do you need to use PCs while playing guitar to use them? or is there some way i can store it to use on my digitech whammy?
You can get a MIDI controllers in footswitchable form.
No, i think you're confused. Midi footswitches are for midi capable amps and effects. They can switch between presets in your effects units. If your whammy has a midi out then yes it would work. Otherwise no.
my whammy has a midi in, that what you mean?