Electro Harmonix Pulse Modulator

Pulse Modulator is THREE tremolos in one box. It has a control to boost the signal as well. The upper three knobs are PULSE SPEED, which set the speed of the effect. The second row of knobs are labeled PULSE VOLUME. These set the relative volume of each tremolo. The knob at lower left is the BOOST VOLUME, with the on/off switch on it as well. This controls the level of the boosted signal. The last knob, at lower right, is the PULSE ATTACK, a sort of tone control for the tremolos. Your output is connected to the appropriate output jack, depending on which effect you're using.

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