Arturia VOCODER V User Manual page 67

Input LP Freq This sets the cutoff frequency for a low pass filter that processes
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the input signal prior to passing through the reverberation. An excessively bright
input can make the reverb sound brittle, harsh, or unnatural, so reducing high
frequencies can often give a "sweeter" reverb tone.
Input HP Freq This sets the cutoff of a high pass filter that processes the
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input signal prior to passing through the reverberation. Adding reverb to low
frequencies can make the overall sound muddy, bass-heavy, and indistinct.
Trimming the low frequencies often gives a clearer, more defined reverb effect.
Arturia - User Manual Vocoder V - The Effects 63