I use an iPad playing AVI files that include both scrolling chord sheet video and .WAV audio. Output from the iPad goes through a lightning cable into an audio interface, and the output from the audio interface goes into my Yamaha StagePas1K Mark II or to a JBL Eon One Compact for small rooms. I use the free VLC video player to organize and trigger everything. It's nice to be able to simply scroll and click with the fingers of one hand and to be able to glance at the scrolling chart if necessary.

The iPad is very light and thin and fits into a gig bag pocket designed especially for tablets. I'm very happy with this arrangement.