Possibly this was the change from Iyzsong which enabled sound here,
```sh
$ git diff fbbbc2088ce933d83f5b0be75308fdcb6b40fa57
d9368572abd3683bed4263eb5e149bb404baee59
diff --git a/gnu/packages/qt.scm b/gnu/packages/qt.scm
index 76e9e519c7..01327f6ccf 100644
--- a/gnu/packages/qt.scm
+++ b/gnu/packages/qt.scm
@@ -2708,7 +2708,8 @@ (define-public qtwebengine-5
"src/buildtools/config/linux.pri"
(lambda (in out)
(display (get-string-all in) out)
- (display "\ngn_args += use_system_openh264=true\n" out)))
+ (display "\ngn_args += use_system_openh264=true\n" out)
+ (display "\ngn_args += link_pulseaudio = true\n" out)))
;; Qtwebengine is not installed into the same prefix as
;; qtbase. Some qtbase QTLibraryInfo constants will not
;; work. Replace with the full path to the qtwebengine-5
```
No equivalent is found by me in the qtwebengine definition that supplies
qtwebgine 6
