I've been doing this for five or six years. I have a file entitled "complete set" which contains all of the tunes I play live. Before a gig I add a number in front of the name of the tune 1,2,3,etc. Those tunes I plan to use then come to the top of the list of tunes when I hit the song button.

I use the earphone jack for audio and a Roland Synthesizer for digital sound. Both go into a mixer.

Richard