Quad Function Generator Model 281t

Four function generators after the Buchla 281, each an attack-decay envelope with its own trigger input and button, cycle input and three-way mode switch (transient, sustained, cycling), control voltage inputs for attack and decay from 1 ms to 10 s, an output, an end-of-cycle pulse and two lamps. Paired in quadrature, A with B and C with D, they become phase-shifted cycling oscillators with two outputs, their phase set by a large knob. Part of the Buchla & Tiptop Audio 200t series, made under licence from Buchla.