Buttons have tooltips, hover on a button with your mouse to see what the button does. Add values and then press "Draw" to draw the graph. Y Multiplier basically just corrects the values if they don't fit, for now it can only be done manually. Sounds represent the position of drawing dot on Y axis. You can change speed by pressing, logically, the "Speed" button. By pressing "Add random numbers" button, you can add a bunch of random values (what did you expect?). Random values take a bit of time to generate, but they sound funny and draw nice pictures. Default Y is -170.
