I just upgraded to the latest MusicReader and worked on some different options printing from Sibelius and the initial results are surprisingly readable on the iPad. The proof will be when it works on a gig. I'll report when I've taken it out.
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Graham, Korg Pa1000, Korg G1 Air, Countryman E6, Roland BA330, 2 x Roland CM-30, , Mackie SRM150