We recorded the text of "She'll be Coming 'Round the Mountain" into the Sequencer. Every time the Sequencer is pressed, a page of the book is read. You can also plug an external switch into the Sequencer. For this activity, we plugged a Pneumatic Switch into the Sequencer, and placed the squeeze cowboy boot on the Pneumatic Switch. Every time the boot is squeezed, a message plays. This is a fun way to add objects to activities!