For reference I'm developing https://ossia.io in Qt (widgets), it does not pan out too bad I think (https://raw.githubusercontent.com/OSSIA/score/master/docs/sc...)
FYI, OSSIA failed on start under Debian 10 :/
$ ./score-v3.0.0-a4-Linux.AppImage
Illegal instructionyeah, I was a bit ambitious and required an AVX cpu for the alpha but you're the second person with a CPU without even SSE4 in less than two weeks so I'll revert to a SSE2 baseline :/
wxWidgets?
For audio-related software (such as Helio Workstation[0]) there is JUCE.[1]
[0] https://github.com/helio-fm/helio-workstation
[1] https://en.wikipedia.org/wiki/JUCE