Currently there seems to be a way to precisely place a note on the curve. If you add a node, you can move it to a known location such as x =0, y = 0. Pressing the right arrow key twice will move the node to x = 1, y = 0. Pressing the up arrow once will then move the node to x = 1, y = 1. The vertical grid lines are at x = 64, 128, 192, 255. The horizontal grid lines are at y = 64, 128, 192, 255. With this information you can put a node at any coordinate, although it is obviously tedious to count the key strokes. Nice that they are implementing a more direct method.