Isn't the congregation supposed to already know the words? Just do what my childhood church did: don't sing. They were Quaker. But I forgive them.
You could just tape a standard remote-clicker to the floor and step on it. I've never heard of a pedal though.
Does anyone know of a foot pedal that can advance PowerPoint slides? I am looking for something that can be placed on a stage which is about 50' from the computer. Are there any wireless options?
I know this is an odd request but it for someone who wants to be able to play piano while advancing the slides that have the lyrics... I just know I am not that talent.