Minim 

triangle 
Description Constructs a perfect triangle wave with the specified duty cycle.Signature Wavetable triangle(float dutyCycle) Parameters dutyCycle — float: a triangle wave with a duty cycle of 0.5 will be a perfect triangle wave that is 1 half the time and 1 the other half. By changing the duty cycle, you change how much of the triangle is below zero. So, a duty cycle of 0.2 would result in 20 percent of the triangle below zero and the rest above. Duty cycle will be clamped to [0,1].Returns Wavetable Related WavesWavetable Waveform Example None available Usage Web & Application 