DS 88 Pedal and Mic suggestion

[Jruacho77]

My 9 year old plays a DS 88 in a rock band. I am trying to help him utilize the features. Is there an easy way to set up a pedal so it switches between patches. Specifically, I set up a performance patch where he can use the mic by playing a specific part of the board and it gives a robotic sound. He doesn’t have to change patches during this song because this patch has 11 sounds built in and split around the keyboard. However, we would like to use a pedal to switch vocal patches. Any suggestions?