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freq = 1;
amp = 110;
loopTime = 3; // in seconds
t = time % loopTime;
wiggle1 = wiggle(freq, amp, 1, 0.5, t);
wiggle2 = wiggle(freq, amp, 1, 0.5, t - loopTime);
linear(t, 0,  loopTime, wiggle1, wiggle2)

freq=0.5;
amp =100;
seedRandom(index+time*freq);
wiggle(0,amp);