I have this issue too.

Hardware is a different external USB DAC (not Focusrite):

$ lsusb | grep DAC
Bus 005 Device 004: ID 08bb:2704 Texas Instruments PCM2704 16-bit stereo audio 
DAC

Symptoms: Clicking sounds. Irregular but pretty frequent, up to once a
second.

It happens on kernel 5.13.0-37, but it goes away if I revert to
5.13.0-35.

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-signed-hwe-5.13 in Ubuntu.
https://bugs.launchpad.net/bugs/1966066

Title:
  audio from external sound card is distorted

Status in linux-signed-hwe-5.13 package in Ubuntu:
  Confirmed

Bug description:
  The sound card is a Focusrite Scarlett 2i2.

  The sound is distorted everywhere.

  Sound via HDMI works.

  Seen others having the same problem:
  (Edit because of previously wrong link here) 
https://askubuntu.com/questions/1398614/upgrading-to-5-13-0-37-generic-breaks-audio-with-external-audio-card

  ubuntu release: Ubuntu 20.04.4 LTS
  package name involved in bug: linux-image-5.13.0-37-generic

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.13.0-37-generic 5.13.0-37.42~20.04.1
  ProcVersionSignature: Ubuntu 5.13.0-35.40~20.04.1-generic 5.13.19
  Uname: Linux 5.13.0-35-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.21
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Mar 23 12:56:02 2022
  InstallationDate: Installed on 2020-12-18 (459 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  SourcePackage: linux-signed-hwe-5.13
  UpgradeStatus: No upgrade log present (probably fresh install)

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