What is interesting, android-sdk-platform-23 is also available in the same Ubuntu repository. It was also installed on Devuan 5 Daedalus without any problems:

$ sudo dpkg -i libandroid-23-java_6.0.1+r72-6_all.deb libandroid-uiautomator-23-java_6.0.1+r72-6_all.deb android-sdk-platform-23_6.0.1+r72-6_all.deb
(Reading database ... 399860 files and directories currently installed.)
Preparing to unpack libandroid-23-java_6.0.1+r72-6_all.deb ...
Unpacking libandroid-23-java (6.0.1+r72-6) over (6.0.1+r72-6) ...
Selecting previously unselected package libandroid-uiautomator-23-java.
Preparing to unpack libandroid-uiautomator-23-java_6.0.1+r72-6_all.deb ...
Unpacking libandroid-uiautomator-23-java (6.0.1+r72-6) ...
Preparing to unpack android-sdk-platform-23_6.0.1+r72-6_all.deb ...
Unpacking android-sdk-platform-23 (6.0.1+r72-6) over (6.0.1+r72-6) ...
Setting up libandroid-23-java (6.0.1+r72-6) ...
Setting up libandroid-uiautomator-23-java (6.0.1+r72-6) ...
Setting up android-sdk-platform-23 (6.0.1+r72-6) ...

android-sdk-platform-23
_http://us.archive.ubuntu.com/ubuntu/pool/universe/a/android-framework-23/android-sdk-platform-23_6.0.1+r72-6_all.deb
libandroid-23-java
_http://us.archive.ubuntu.com/ubuntu/pool/universe/a/android-framework-23/libandroid-23-java_6.0.1+r72-6_all.deb
libandroid-uiautomator-23-java
_http://us.archive.ubuntu.com/ubuntu/pool/universe/a/android-framework-23/libandroid-uiautomator-23-java_6.0.1+r72-6_all.deb

As the names suggest, all these debs are native Debian packages, which were somehow appropriated by Ubuntu.

The native Ubuntu packages look like this:

android-sdk-platform-23_6.0.1+r72-6ubuntu1_all.deb

android-sdk-platform-23 is needed to compile scrcpy on Devuan 5 Daedalus (see above).

The source is android-framework-23

android-framework-23_6.0.1+r72.orig.tar.xz	     2016-11-11 
android-framework-23_6.0.1+r72-6.debian.tar.xz	 2021-01-02 
android-framework-23_6.0.1+r72-6.dsc	         2021-01-02 

It is 100% Debian source without Ubuntu patches.
It is available in the same Ubuntu repository:
_http://us.archive.ubuntu.com/ubuntu/pool/universe/a/android-framework-23/android-framework-23_6.0.1+r72.orig.tar.xz
_http://us.archive.ubuntu.com/ubuntu/pool/universe/a/android-framework-23/android-framework-23_6.0.1+r72-6.debian.tar.xz
_http://us.archive.ubuntu.com/ubuntu/pool/universe/a/android-framework-23/android-framework-23_6.0.1+r72-6.dsc

$ cat /var/lib/dpkg/status | grep android-sdk-platform-23 -B11
Package: android-sdk
Suggests: android-sdk-platform-23, maven, proguard-gui 

Why isn't android-sdk-platform-23 available in the Devuan 5 Daedalus repository?

Ubuntu package scrcpy_1.25-1_amd64.deb  libavformat59 (>= 7:5.0)

Devuan:

$ apt show libavformat59
Package: libavformat59
Version: 7:5.1.5-0+deb12u1

   
_http://us.archive.ubuntu.com/ubuntu/pool/universe/s/scrcpy/
_http://us.archive.ubuntu.com/ubuntu/pool/universe/s/scrcpy/scrcpy_1.25-1_amd64.deb

$ dpkg-deb --info scrcpy_1.25-1_amd64.deb
 new Debian package, version 2.0.
 size 75486 bytes: control archive=949 bytes.
     740 bytes,    16 lines      control              
     707 bytes,    10 lines      md5sums              
 Package: scrcpy
 Version: 1.25-1
 Architecture: amd64
 Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
 Original-Maintainer: Yangfl <mmyangfl@gmail.com>
 Installed-Size: 198
 Depends: libavcodec59 (>= 7:5.0), libavdevice59 (>= 7:5.0), libavformat59 (>= 7:5.0), libavutil57 (>= 7:5.0), libc6 (>= 2.34), libsdl2-2.0-0 (>= 2.0.12), libusb-1.0-0 (>= 2:1.0.16), scrcpy-server (= 1.25-1)
 Recommends: adb
 Section: net
 Priority: optional
 Homepage: https://github.com/Genymobile/scrcpy
 Description: Display and control your Android device
  This application provides display and control of Android devices connected on
  USB (or over TCP/IP). It does not require any root access.
  .
  This package contains the client (desktop) binary. 

scrcpy-server_1.25-1_all.deb
_http://us.archive.ubuntu.com/ubuntu/pool/universe/s/scrcpy/scrcpy-server_1.25-1_all.deb

It was installed without problems:

$ sudo dpkg -i scrcpy_1.25-1_amd64.deb scrcpy-server_1.25-1_all.deb
(Reading database ... 391780 files and directories currently installed.)
Preparing to unpack scrcpy_1.25-1_amd64.deb ...
Unpacking scrcpy (1.25-1) over (1.25-1) ...
Selecting previously unselected package scrcpy-server.
Preparing to unpack scrcpy-server_1.25-1_all.deb ...
Unpacking scrcpy-server (1.25-1) ...
Setting up scrcpy-server (1.25-1) ...
Setting up scrcpy (1.25-1) ...
Processing triggers for bamfdaemon (0.5.6+repack-1) ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for mate-menus (1.26.0-3) ...
Processing triggers for desktop-file-utils (0.26-1) ...
Processing triggers for mailcap (3.70+nmu1) ...
Processing triggers for hicolor-icon-theme (0.17-2) ...
Processing triggers for man-db (2.11.2-2) ...

$ whereis scrcpy
scrcpy: /usr/bin/scrcpy /usr/share/scrcpy /usr/share/man/man1/scrcpy.1.gz 

$ scrcpy
scrcpy 1.25 <https://github.com/Genymobile/scrcpy>
* daemon not running; starting now at tcp:5037
* daemon started successfully
ERROR: Could not find any ADB device
ERROR: Server connection failed 

I do not have any Android.

Thank you for the link!
It has links to old and new sources.

I will try to compile this:

But I do have any sort of Android.

@ralph.ronnquist
Perhaps, the simplest way is to download the source code (tars + dsc) manually from the Chimaera repository. This will not cause any "conflics".

Could you provide the link?

Perhaps, you may better try to rebuild. This sort of practical knowledge may liberate from frustration.

You may try to rebuild the package for your Devuan.

sudo apt-get install build-essential debhelper devscripts 

apt show devscripts

1. Download the Debian source code (tars, dsc) manually.
You may also try sources from Ubuntu, or Ubuntu PPA.
For example, to rebuild wxMaxima for Devuan5, I used this source:
_https://launchpad.net/ubuntu/+source/wxmaxima/24.02.1-1build2

2. Extract the source code

dpkg-source -x *.dsc

3. cd to the source code directory

4. Install build dependencies

sudo mk-build-deps -i

5. Build the package

dpkg-buildpackage -us -uc -b

EDIT:
To avoid troubles, you may check build dependencies before installing them

$ mk-build-deps --help | grep "Build-Depends dependencies" -B2
    -B, --build-dep
        Generate a package which only depends on the source package's
        Build-Depends dependencies. 

dpkg-deb --info *.deb

You may also check dependencies before installing the package.

Actually, I am very happy that Debian devs managed to compile maxima which works.
It seems that it was a real problem. Without maxima, wxMaxima is useless.

$ maxima
Maxima 5.46.0 https://maxima.sourceforge.io
using Lisp GNU Common Lisp (GCL) GCL 2.6.14 git tag Version_2_6_15pre3 

Debian devs used a certain version Common Lisp from git. It works.
Fedora devs used another Lisp, not Common Lisp. The result is "segmentation fault".
On Fedora, you open wxMaxima, type a command, execute it, and wxMaxima does not react.
The Fedora users cannot understand what is going on.
You can compile the same version of wxMaxima on Devuan. It works, because maxima works.

It seems that flatpak is a sort of simple solution to all problems, a sort of cargo cult ritual, perhaps.

If it works with pulseaudio, it does not mean that it cannot work with "pure alsa".

But I can agree that it might be difficult to create a correct ~/.asoundrc
That is why, I am using arateconf.

I also do not have sound devices defined in the Firefox settings (about:support).
And, nevertheless, sound works with "pure alsa".

On Devuan Daedalus 5.0, sound works in Firefox out of the box, after the removal of pulseaudio
_https://dev1galaxy.org/viewtopic.php?pid=49837#p49837

The problem might be that you want to use your Audigy2, and it is not the default device.
The simplest solution to such problems is to run

arateconf

and select Audigy2 as "default device".
The manual is here:

ALSA without PulseAudio and PipeWire
_https://dev1galaxy.org/viewtopic.php?id=6644

If you start a new topic, and I will try to help.

NOTE: It is not necessary to remove PulseAudio. You can remove it later, when ALSA is configured and sound works with

apulse firefox 

Some useful commands for testing ALSA, you may find here:
_https://dev1galaxy.org/viewtopic.php?pid=50114#p50114
_https://wiki.archlinux.org/title/Advanced_Linux_Sound_Architecture

Yes, I am using my method, and it works.
If the goal is to improve sound quality on your computer, you can simply remove pulseaudio and/or pipewire, install Petrov's fftrate plugin, and configure it for 32bit 192kHz (Intel HDA), or other HiRes format, if it is supported by your sound card. For USB headsets, you may try 16bit 48kHz.

OK, if you want to make an audio test, you may try something like this.

Take a free sample of 32bit Float DXD
_https://positive-feedback.com/reviews/music-reviews/what-we-hear-with-dxd-32-bit-files/
and downsample it with the fftrate resampler to different audio formats.
For example:
1. DXD to 192kHz 32bit (or 24bit)
2. DXD to 48kHz 16bit

Install Audacious and the fftrate ALSA plugin.
To prevent resampling, configure fftrate to 192kHz.
In Audacious, select ALSA output and set "Bit depth".
Then, you can play 192kHz wave.

Then, you can reconfigure fftrate for 48kHz 16bit format, and play 48kHz 16bit wave.

audacious 2>&1 *.wav 

Yes, it is something like this, or even worse.

I am waiting for Steve Gibson to tell the story in details.

EDIT:
Security Now: CrowdStruck
_https://youtu.be/eLkfKizz6NU