You don't know Qtractor, we don't know EDuke32, so you could say one thing, and we could interpret it differently (as happened to me with the ALSA MIDI connection, which was ultimately possible), and vice versa.
I think using a DAW as a MIDI player is like shooting flies with a cannon. I don't know if there's a host that works directly with VST and ALSA MIDI. It would be the simplest option. That way, you could connect EDuke32 directly to Sound Canvas VA. Something like jack-dssi-host, but for vst.
I don't know if anyone can advise you on this second option.
You don't know Qtractor, we don't know EDuke32, so you could say one thing, and we could interpret it differently (as happened to me with the ALSA MIDI connection, which was ultimately possible), and vice versa.
I think using a DAW as a MIDI player is like shooting flies with a cannon. I don't know if there's a host that works directly with VST and ALSA MIDI. It would be the simplest option. That way, you could connect EDuke32 directly to Sound Canvas VA. Something like jack-dssi-host, but for vst.
I don't know if anyone can advise you on this second option.