"Module a-137-2 is another version of a wave multiplier. in contrast to the a-137-1 wavemultiplier i the a-137-2 generates four phase-shifted copies of a vco signal applied to the audio input. the four shifted signals are added to the original signal to obtain a fat sound similar to five independent vcos. the phase shifting is made by a simple circuit that works only for sloped signals like sawtooth, triangle or sine, but not for rectangles or pulses"
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