This can be used to find out what an interval is. Press green flag. If you're 100% sure you know what the 2 notes of the interval are, press the lower button. If you don't really know and prefer writing them on the stave (which I recommend), press the higher button. Watch out for accidentals that could be before the interval, in the same bar, as this will make a difference. Use the up & down arrow keys to move the notes up and down in the stave To switch which note you are moving press the left/right arrow key or click the note you want to control You can add accidentals to the notes by pressing the buttons in the tool bar at the bottom (note that in the second tool bar, accessed by pressing the blue triangle, that these buttons don't do anything just yet, but I will make them function soon) Remember that the red note, should always stay below or level with the green note! You may get a strange answer if this isn't the case! Press 'space' to solve and hear the interval. It will either say there is an error, because you have put a note in incorrectly, or it will tell you the interval of the two notes you put in.
Took a few days. Used Wikipedia to get the clef images, rest by me. Was taught by someone how to solve intervals with a method like this (but on paper). Please tell me about any bugs if you find any. I know that you can move notes to far up/down but if you do this just start again as the notes may not be in there proper positions. Other wise, should all work.