The lead was composed note by note, as is my usual way. Imagine a keyboardist with no hands, that's the level of playing ability I have on the musical keyboard. :) I do envy the real players here like Steve D and Luigi.
Buy yourself an Ableton Push 2. You can use it today with Bitwig, and next month with Ardour 5. Use it in "in-key" mode and every note you hit will be in key. It is like magic! :)