Unreal Book works for me. Not perfect, but fast enough. Import all the PdF books (real books 1,2,3 - Colorado, etc...) and the Master Index page. Find thetune on the ,aster index, go to your preferred book and enter the page number of chart. Unreal book lets you set the page 1 to match pg 1 of each book. Then, from the GO button in the menu you simply enter the page of a tune and it takes you right to it. Again, not perfect but I can find a tune, go to necessary book enter page and be there in less than 20 seconds.