This Pedal is currently available.
Footswitch
The robust, stainless steel Z-4 dual footswitch is suitable for all our amps for switching two functions, such as Channel and Reverb. The selected channel or feature is displayed via an LED.
https://www.engl-amps.com/shop/accessories/engl-z4-footswitch/
Engl Z-4 Footswitch
Engl Z-4 Footswitch