Yesterday arrived my second module as i have ordered some of them.. Identical to the first same type IC , etc...
It PLAYED just out of the box! Have the same behavior when plays(LED) so i think that the first one has something with audio output.. seems to play but not sound on the speaker or audio out pin.
But i am still looking for a "gapless" solution or the ability to have a long sound file and jumps into parts of it with no or very short delay...