It plays the music like it should do and all features are working.
While creating a website I realized a problem:
If you put 2 modules of the player at one site (one beneath the other)there was a problem at the frontend uploader: if each module has got different and separate upload folders (you can set them at the advanced parameters in the backend) this was not working. At the frontend both modules showed you only one (the same folder) to upload.
After contacting the service of projoom they reacted very fast, professional and kindly.
Today they updated a new version of the player (1.3.4) and the problem is solved.
Many thanks to the service and I wish you good luck with future development.