Print landscape at 100% (actual size, not "fit to page"). Each page has its own code next to the title, so swapping pages on the table switches the instrument in the app. Keep the black squares flat and uncovered. Melodic rows are numbered 1 (lowest) to 8; the numbers always match the app. Note names are for the key you pick here: set the same key in the app (Settings) and the names match too. Use coloured or dark chips that fit inside a cell (8-row mats need chips under about 15 mm).