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Cause of above, was me added the wrong repo to debian 12.4 based mxlinux 23.1.
After adding ( deb https://ppa.launchpadcontent.net/rncbc/apps-jammy/ubuntu jammy main ) repo to /etc/apt/sources.list.d/mx.list and adding the key via terminal :
sudo gpg --keyserver keyserver.ubuntu.com --recv-keys 74407499CD30F338
sudo gpg -a --export 74407499CD30F338 | sudo apt-key add -
sudo apt-get update

.. I did find the latest Qtractor in MX Package Installer.
New installed Qtracktor 9.37.8, Qt 6.4.2, Color theme Wonton Soup / Style theme Fusion running and looking great on a fresh MX23.1 KDE.

Maybe for someone else this information is helpfull.
Link forum
Thanks to Rui for adequate help support !!