Starting with macOS Sierra (10.12), any application distributed outside the Mac App Store runs from a randomized path.
So the program can't correctly determine its home directory (where the app and all its files are located).
What can go wrong:
SunVox: loss of the previous session, incorrect copy/paste;
Virtual ANS and other Pixilang-based apps: program can't start at all, and you will just see the Pixilang file selection dialog.
Workarounds (choose one)
RECOMMENDED:
open Terminal and enter the following command:
xattr -r -d com.apple.quarantine /PATH_TO_THE_APP/EXE
where EXE is the name of the main executable file of the app: SunVox.app or START_MACOS.app
examples:
xattr -r -d com.apple.quarantine ~/Desktop/sunvox/sunvox/macos/SunVox.app
xattr -r -d com.apple.quarantine ~/Desktop/virtual_ans/START_MACOS.app
ALTERNATIVE:
move the SunVox.app or START_MACOS.app to some other folder (using the Finder), then move it back;
try to launch the app again;
Virtual ANS launch example:
ALTERNATIVE 2:
if the previous methods for some reason did not help:
go to the system settings -> Privacy & Security -> confirm the opening of the app (at the bottom of the window);
right click on the SunVox.app or START_MACOS.app and press Open.