Qtractor with SCVA work not well.

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PC Arch Linux KDE

Qtractor https://archlinux.org/packages/extra/x86_64/qtractor/
yabridge https://archlinux.org/packages/extra/x86_64/yabridge/
realtime-privileges https://archlinux.org/packages/extra/any/realtime-privileges/

Steam https://archlinux.org/packages/multilib/x86_64/steam/ with Proton Experimental
VSThost https://www.hermannseib.com/programs/vsthostx64.zip

SCVA: Roland Sound Canvas VA https://archive.org/download/roland-sound-canvas-va/Sound%20Canvas%20VA… , official https://www.roland.com/us/products/rc_sound_canvas_va/ , abandonware https://support.roland.com/hc/en-us/articles/30557546290459-Sound-Canva… , a MIDI VST plugin

02 - Freebee.mid in https://www.vgmpf.com/Wiki/images/6/68/DX-Ball_%28W32%29.zip .

Because https://www.reddit.com/r/linuxaudio/comments/1ae3nx1/anyone_know_what_t… so I installed realtime-privileges , sudo usermod -aG realtime a then reboot.

This .mid sounds correct by vsthost.exe (by Proton) with SCVA, but not by Qtractor & yabridge with SCVA: at least 1 track is played intermittently, why? Is it a Qtractor bug?

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sorry to tell, support to non-native linux plugins, whatever their type, is not really a top priority here :S

also, yabridge, which is a dang PITA to work with in every other winehq update, is way out of scope here too--if not none at all.

so sorry again.

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Well ok, I can use VSTHost to play my .mid, but:

https://www.rncbc.org/drupal/node/2805 , https://wiki.archlinux.org/title/User:Jebez/How-tos_about_MIDI_%26_SCVA… , now the question is: how to route the EDuke32 MIDI output to the SCVA input, using VSTHost, or other, Carla https://kx.studio/Applications:Carla ? Carla has Linux & Window$ version, since SCVA is a Window$ software, so maybe better a Window$ VST host, to avoid the issue?

I know it's not your softwares, about VSTHost I found not in the manual https://www.hermannseib.com/documents/VSTHost.pdf (in https://www.hermannseib.com/english/vsthost.htm ), I tried without success (EDuke32: MIDI driver: ALSA MIDI, Device: no devices found), if you know not I'll try https://forum.hermannseib.com/ .

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intermittently: not continuously, sometimes the track is played, sometimes no.

Like I wrote in https://wiki.archlinux.org/title/User:Jebez/How-tos_about_MIDI_%26_SCVA… :
Qtractor, View, Buses..., Master - MIDI bus, Output Plugins, Add..., General MIDI Synth, OK, close General MIDI Synth - Master Out, close Buses, Track, Import Tracks, MIDI..., a .mid file.

An other big update:
Play 02 - Freebee.mid fine
Route the EDuke32 MIDI output to the SCVA input
Route the DOSBox with Duke Nukem 3D MIDI output to the SCVA input https://www.vogons.org/viewtopic.php?t=71282
success by Carla ! I prefer Carla now...

Qtractor is older than Carla, why 2 softwares? Would it have been better if the developers joined Qtractor instead of creating Carla?

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