Expression Pedal movements

Hi,

I use GB09 for recording guitar and bass to backing tracks and use either Guitar Rig 4 or Amplitube 3 as inserts in GB09. I use an Apogee GiO as an audio interface - sounds fantastic.

I'm looking at adding a Roland FV500L expression pedal via the dedicated GiO expression pedal input socket. This should allow me to use the expression pedal as a Vol/Wah/modulation or whatever I assign it to do.

My question is - Where are the "movements" of the expression pedal stored? - I understand that the track I record in GB09 is the native sound of the guitar/bass and that this is processed upon playback (or while monitoring) by the presets in GB09 and/or GR4 and A3.

So how do my movements on the expression pedal get stored in GB09 so that they are replicated and repeated upon playback?

I can't see how it works

Regarrds
Dynapop