chas ... yes, I'm using the Pro12 also, for lead sheets ...
I have it linked to my KB via a USB midi cable ... if I call up a tune on the KB, it automatically calls up the lead sheet on the tablet, and if I call up a lead sheet on the tablet, it automatically calls up the KB settings I want for that song ... quick, easy, and as you said - cheap ... (but still of very good quality)...
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t. cool