This bug was fixed in the package studio-controls - 2.2.7-0ubuntu1

---------------
studio-controls (2.2.7-0ubuntu1) impish; urgency=medium

  [ Erich Eickmeyer ]
  * New upstream bugfix release 2.2.7

  [ Len Ovens ]
  * Set device rates properly (LP: #1946572)

 -- Erich Eickmeyer <eeickme...@ubuntu.com>  Sun, 10 Oct 2021 14:55:20
-0700

** Changed in: studio-controls (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1946572

Title:
  Studio controls hangs on Apply

Status in studio-controls package in Ubuntu:
  Fix Released

Bug description:
  To reproduce:

  1. Go to Extra Devices tab.

  2. Select 'Nvidia 0,0 capture and playback 0' in Select Device to Edit
  drop down menu.

  3. Click on Capture Port Count minus button to reduce it 0. This
  causes Studio Controls to hang. The plus and minus boxes are greyed
  out.

  [A workaround is to restart Studio Controls which makes the plus and
  minus buttons available again but this time click on the All/Off
  toggle. This reduces the capture port count to 0. Then click on Apply
  Audio Settings].

  Traceback (most recent call last):
  File "/usr/bin/studio-controls", line 1039, in xdev_changed
  sub_db['rate'] = int(self.xdev_rate_drop.get_active_id())
  TypeError: int() argument must be a string, a bytes-like object or a number, 
not 'NoneType'

  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: studio-controls 2.2.6-0ubuntu1
  ProcVersionSignature: Ubuntu 5.13.0-16.16-lowlatency 5.13.13
  Uname: Linux 5.13.0-16-lowlatency x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu70
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: KDE
  Date: Sat Oct  9 18:57:30 2021
  InstallationDate: Installed on 2021-10-07 (2 days ago)
  InstallationMedia: Ubuntu-Studio 21.10 "Impish Indri" - Beta amd64 (20210923)
  PackageArchitecture: all
  SourcePackage: studio-controls
  UpgradeStatus: No upgrade log present (probably fresh install)

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