Be nice to hear you doing a gig with the sound from the board... If you are running your mike into the BK-9's mike in, you should be able to simply hit 'record' for each song and a quick 'save' at the end and not have to deal with any other gear.
BTW, are you using the iPad Performance editor yet? It's free...
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An arranger is just a tool. What matters is what you build with it..!