Just a small note about using a sequencer as a fake book: You don't need to use the midi file for anything else than for showing the notes, chords and the lyrics. Just synchronise the sequencer to your keyboard's midi clock, if you want the sequencer to follow your playing. You don't need to connect the midi output of the laptop to the midi input of your keyboard. This way you can play the keyboard the way you like (and make as many mistakes you like ;-).

If you don't want the sequencer to follow, then you don't need any midi connections, but you need to change the pages yourself (and probably also scroll the screen yourself).

And of course you can record the tune in advance by youself using the sequencer. In this case you probably don't want to have too many mistakes in the file. Luckily it is easy to make small corrections with a sequencer. So you don't need to have a commercial/downloaded midifile. You can make it yourself, if you prefer that.

And finally, if you only need the lyrics and the chords, then you can use the sequencer of your keyboard to show them while you are playing, provided it supports lyrics and chord display. Just mute all the tracks or remove all the notes from the midifile, if you don't want it to play. However, not all keyboards support using the sequencer and the auto accompaniment at the same time.

Kari