Holding notes C4-Ab4 with A2+D4 (40ohms), A10+D4 (40ohms), and A13+D6 (0 ohm) produces a UFO-type sound. Then A9+D8 (40 ohm) and A11+D8 (40 ohm)captures the held notes when the keys are let go. Last, A2+D7 (ohm threshold) for a long atk, A2+D6 (ohm thr) for a major 3rd 'warble', and A2+D9 (ohm thr) notes rise individually to a high pitch (for the ending).
Keeping a ROM bend at the threshold of activation has an interesting effect where it will randomly trigger for each of the 10 notes individually. This is because the (normally 0V or 5V digital logic) data signal is now floating around the threshold (around 2.2V), and the CPU will read a data line sometimes as a 1, sometimes as a 0. Since each of the 10 notes are at a different point in its cycle, the bend effect (a major third gliss in this song) will only happen if it passes the threshold at the right time in its cycle.
