I answered you in the other thread where you asked this, but here it is again:

Are you talking about the HD bean? There's no MIDI jacks on it, so I think the smallest foot controller available is the FBV Express mkii.

Line 6 use to make a small two button controller called the FBV2 that would let you scroll through 4 presets. You may be able to get one used. I would imagine it would still work with the HD. It's jsut a very limited controller, though. WIth the Express, you'd at least have access to the tuner and the wah/volume functions.

EDIT: Actually, I guess the FBV2 hasn't been discontintued. It's still available as new.