[LAU] vmpk problems

[Peter P.]

Hi list,

the vmpk virtual screen midi keyboad refuses to start as it does not
find its default midi drivers, exiting after throwing
	Default MIDI IN driver "Network" not found
	Default MIDI OUT driver "SonivoxEAS" not found
	Unable to initialize all MIDI drivers. Terminating.

There seems to be no way to set these via flags or config file.

Trying the more recent vmpk application image from 
https://sourceforge.net/projects/vmpk/files/vmpk/0.7.2/vmpk-0.7.2-linux-x86_64.AppImage/download
fails as it sees to require pulse audio(?).

Does anyone have an idead about the above problem or can suggest an
alternative software midi keyboard? Thank you so much! P