I too have sometimes found RealBand a little flaky. It will sometimes crash unexpectedly but I have never used it in a gig situation. I am slightly in awe of the complex setups described here. I have sometimes used my large format iPad Pro for gigs with backing tracks. I have the music display app forScore which means I have words and music on display. Also good as I don’t need music stand light since I am using an iPad. With forScore you can associate any file with a wave or mp3. This means you have the music up and simply click controls to start playback. You control the output level from theiPad too and it will even turn pages back and forward for you at the right place in the audio track which is cool. Saves having to take huge files of music around as you can put all your music on the iPad. I plug the output of the iPad into my keyboard which then supplies it to my mixer. All nice and simple which suits me!