SMidiArp Seq LV2 plugin crashes in Ardour and Carla about qmidiarp

[emuse]

Related to #7:

I cannot reproduce the qmidiarp lv2 plugins not working in qtractor with transport.

As to other lv2 hosts:

They do work with jalv.qt5, jalv.gtk and Ardour 5 here, including transport.

As to Ardour, you are probably aware that ardour disapproves non-statically linked (self-contained) plugin GUIs (there is lots of discussion on that topic out there), and unfortunately qmidiarp falls into that category.

I had checked with Carla (2.0) once and it worked, too, but I cannot tell what the current status is.

So there's at least two different issues in your case, one with qtractor and transport and probably others with the suil library and I don't know about carla.

For the transport issue, you may check whether this works when qmidiarp is in standalone mode (qmidiarp app) with the jack transport button checked ?