Possible audible clicks when turning Filter Cutoff to Off

Bug Archive
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1

Bug Description

What happens?
When using the LP RD3 filter model, turning the Cutoff parameter fully to the right (Off position) results in an abrupt transition. The filter behaves smoothly as it approaches the upper frequency range (e.g., 20 kHz), but suddenly switches off completely, creating a perceptible discontinuity in the sound.
This issue does not occur with other filter models, such as LP SV24 or LP SV12, which exhibit a smoother and more natural transition as the cutoff frequency is increased to the maximum.

Expected behavior:
The LP RD3 filter model should have a smooth and gradual transition between the maximum cutoff frequency (e.g., 20 kHz) and the Off position, similar to other filter models.

Steps to Reproduce

  1. Choose ACD Engine
  2. Load a preset or init
    3.Select the LP RD3 filter model in the filter section.
  3. Gradually increase the Cutoff parameter to the maximum value (Off position).
  4. Observe the abrupt change as the filter transitions from the upper frequency range (20 kHz) 6. to the Off state.
  5. Repeat the steps with another filter model (e.g., LP SV24 or LP SV12) and note the smoother transition to the Off position.

Occurrence / Frequency

Always

Found in Firmware

  • Version: 1.0.1
  • Build: 1459

Attachments

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8

Hi @s.hiersemann , thanks for bringing this up. This is by design: the Off position switches the filter off (bypass) so there is discontinuity at this point. Up until that point the filter still affects the signal, so depending on the signal that comes in and the filter type there might be an audible click in some cases. Hope this helps and thanks for your support.