Reverse Saw-tooth wave
Select components:
Freq=1, amp=1, phase=0°
Freq=1+2, amp=1,1/2, phase=0°,180°
Freq=1+2+3, amp=1,1/2,1/3, phase=0°,180°,0°
Freq=1+2+3+4, amp=1,1/2,1/3,1/4, phase=0°, 180°, 0°, 180°
Freq=1+2+3+4+5, amp=1,1/2,1/3,1/4,1/5, phase=0°, 180°, 0°, 180°, 0°