The Roland FC-300 MIDI Foot Controller is one of the most versatile and powerful foot controllers on the market. Features such as simultaneous MIDI data transmission in both directions between FC-300 and Roland VG-99 (via the newly developed RRC2 protocol), storage of 100x MIDI patches and 2x expression/control pedals, mean this sophisticated pedal is the ideal complement to Roland's new VG-99 V-Guitar system and other MIDI instruments designed for live performances.
The main features of the Roland FC-300 MIDI Foot Controller include:

Roland FC-300 MIDI Foot ControllerI find this to be way too expensive but the best option to control a VG99. Build quality is excellent. Very sturdy will take all kinds of beating.
Depending on what you want to control, you can find cheaper alternatives.