Hi @FlorianBome , thanks for your reply.
That 0,1% CPU of Bome Network tool sounds very good!! 
I hope you can get same or similar CPU usage for MIDI Translator in background.
I also would add a wish here: It would be nice to have the option to run Midi Translator in background without having any icon in the status bar.
Last comment: I have purchased the license, I’m happy to be new customer of this great software!! 