SD-D Chorus

This module provides the most authentic experience of using the original hardware.

This chorus unit is based on a stereo pair of modulated delay lines. The left channel is delayed and re-injected mainly into the right channel (also in the left channel with a smaller level) and vice-versa. The delays are modulated by a Low Frequency Oscillator which has an impact on the pitch. As a result, these modules can take a mono input and create a stereo output.

Parameters are fixed: the SD-D Chorus only lets you select between 3 different modes which change the delay, its range, and the rate of the LFO (delay variations) under the hood. The last button at the bottom of the column is an effect boost toggle to enhance modes 1, 2, and 3. Its associated screw lets you increase the level of the delayed signal.

Bias and Smoothing allow you to alter the shape of the LFO. By design, the LFO is triangular, which means that the delayed signal is alternatively pitched up and down without a smoothed transition. Smoothing morphs the LFO to a sine-like shape, effectively smoothing the transition between pitching up and down. Bias makes the LFO asymmetrical, emphasizing more heavily the pitching up or the pitching down. These two controls are identical between the two modules.

The HP Cutoff lets you filter out more or less low end on the delayed signal path.

Finally, Mix allows to blend between dry and wet signals.

Signal Flow