adau1701 Setting up parallel delay modules causes severe comb filtering issues.

As shown in the image, I split a single signal path into three parallel paths and inserted a delay module into each downstream path. When I set the value limit to 512 samples, the result was that even when the current value was 0 and all other processing was bypassed, the actual output from the two signal paths still exhibited severe comb filtering.

so my question is, why and how I fix it？

Audio Signal Processors

hardware

SigmaDSP Audio Processors

adau1701