https://bugs.winehq.org/show_bug.cgi?id=52432
--- Comment #4 from john jwork123nl@yahoo.com --- OK, good that it is a know problem. Any idea if/when this will be fixed?
To test this yourself Install reaper from here: https://www.reaper.fm/download.php You can use the Windows version and install it under wine - works perfectly Download the windows demo of the Legend from here and install with wine: https://www.synapse-audio.com/thelegend.html
run reaper and install virtual instrument on new track - choose the legend. Observe the missing elements of the gui.