Hi Pat,
thanks a lot for all your thoughts.
2nd & 4th: I used Melodyne and tweaked a little. But I didn't want to force anything.
You are right, the recording was hidden (my son's mobile) because Piet doesn't like to be recorded.

Hi Eric, Lawrence, Danny, Dani, Mario, Noel, Herb, and Rog,
thank you very much for your kind words.

Hi Floyd,
thanks for your compliments. I'm thinking of that video thing. But I don't think I'll get Piet to really perform. When he sees my son's mobile he says: "Only listen not talk".

Guenter