For Deus Ex multiplayer, follow the instructions found at
https://333networks.com/instructions/deusex to configure multiplayer.
The original multiplayer master server master0.gamespy.com
no longer exists, so you will have to change it in Deus Ex's .ini file.
333 Networks' discord chat channel is
https://discord.com/invite/4d9m6XN5jw.
To play the game soundtrack outside of Deus Ex, open audio programs like Audacious or VLC and drag files from your
Deus Ex\Music\ subfolder into either program.
.umx files are tracker audio files also used most famously in Unreal Gold, and Unreal Tournament GOTY / 99.