subprocess.Popen does not launch audacity

Using Python 3.12.3 on Ubuntu 24.04
I've converted a legacy python2 script to python3. All went well. However, a glitch from python2 remains.
The script uses dmenu to create menus to pick applications. Applications are then invoked from python
using subprocess.Popen(). I have never been able to successfully launch audacity using this approach,
which does work for other apps.
I can launch audacity successfully using dmenu_run (on its own, outside of the script)
Below is the pertinent code:
  Popen(choice, stdout=PIPE, stderr=PIPE,
                   stdin=PIPE, close_fds=True)
My guess is my argument list is either insufficient or an argument is causing the problem, but am unsure of which.
I have been retired from python programming for ten years, and am pretty rusty, but it is still fun. There are plenty
of other ways to successfully launch audacity but it would be great to make it work from this script.
Thanks in advance
Tim