Despite our confidence in the Model 990's behavior regarding "bypass", we took your post very seriously and double-checked the system path. To do that we performed calibrated measurements and confirmed that the Model 990 does not route analog signals through the DSP circuitry.
More importantly, the tests verified our thought that regardless of the audio path, any differences in the "speed to output" between bypass and a signal that has gone through the Model 990's digital circuitry are infinitesimally small and well outside of our audible range of detection. For that reason, we suspect that some other system variable is at work here. I encourage you to ensure that system levels are matched and that any other potential differences between the two signal paths are accounted for. If all else fails, please try a system reset.
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