Just to make sure that the appimages were not corrupted, I checked both CinGG-20240930-x86_64.AppImage and CinGG-20240930-x86_64-older_distros.AppImage to make sure they played audio.  They did.

On Wed, Oct 23, 2024 at 11:32 AM Bulhwi Cha via Cin <cin@lists.cinelerra-gg.org> wrote:
It's been two months since I ran Cinelerra-GG. I downloaded its newest
version yesterday.

At the moment, I can play and preview my video in the Compositor or
Viewer window. However, I can't hear the audio.

I tried and failed to build Cinelerra-GG. Here's the information about
my desktop computer:

chabulhwi@desktop.semmalgil.com
-------------------------------
OS: Slackware 15.0 x86_64 (post 15.0 -current) x86_64
Host: Micro-Star International Co., Ltd. B360M MORTAR (MS-7B23)
Kernel: 6.11.4
Uptime: 2 hours, 7 mins
Packages: 2319 (pkgtool), 105 (nix-user)
Shell: bash 5.2.37
Resolution: 1920x1080, 3840x2160
WM: sway
Theme: Breeze [GTK2/3]
Icons: breeze-dark [GTK2/3]
Terminal: konsole
Terminal Font: Victor Mono 16
CPU: Intel i7-9700 (8) @ 4.700GHz
GPU: Intel CoffeeLake-S GT2 [UHD Graphics 630]
GPU: NVIDIA GeForce GTX 1660 SUPER
Memory: 7595MiB / 31959MiB
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