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Note: I'm using Ubuntu 16.04
I have launch() working in Windows, but I'm having issues under Linux.
First I tried: launch("/usr/bin/lame", "/home/name/test.wav", "/home/name/test.mp3"); nothing...
Next I tried: launch("lame", "/home/name/test.wav", "/home/name/test.mp3"); nothing...
According to the reference, one of these should work... "On Linux, it first tries gnome-open, then kde-open, but if neither are available, it sends the command to the shell without any alterations."