Once it was done I had to implement a little op-amp in inverse mode to just hear without the headphone the tones (and hence the "musik!") produced :-)
Nothing else, nothing more, here you have the next top 10 hit! "Mary had a little lamb"
Of course, I can not let you go without the debugging session photos!
The source code if you're interested in to know how all this works, and a last video showing the first working version just out of the owen, you will see that you can hardly hear the tones.
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