This Pedal will work with the GFI Specular Tempus. You can program this switch to do many functions on the Specular Tempus. 

Dimensions:
4.39 x 2.34 x 1.06 (inch)

• Bank Up

• Bank Down

• Page Up

• Tap Tempo

• Load-A

• Load-B
  These six functions are straightforward and do not require additional explanation.

• Favorite Preset Call
  This function allows you to designate any one of the 32 available presets as a favorite. With a single tap of a footswitch, you can instantly recall this favorite preset regardless of the currently active one. Tapping the same footswitch again returns you to the previous preset.

• Auto-Swell
  As described in section 2.5, Auto-Swell can be engaged by holding down the footswitch assigned to Bank Up, Bank Down, Page Up, Load-A, Load-B, Tap Tempo, or Favorite Preset—even though it is not listed in the editor software as a selectable option.

• Momentary-A / Momentary-B
  These two functions enable you to momentarily engage the pedal, bypass it, or activate a specific preset (A or B) by holding down the footswitch. This is useful for temporarily activating a sound or effect.

* You will need a TRS Cable for this pedal to work, you can GET IT HERE