Many thanks to those people who sent hints/tips/bug-reports/new ideas ...

Morone <from vdr-portal>
  Reporting stopping visaulization after pausing and starting playback again.
  (fixed in span-0.0.6)

Stefan Hülswitt <s.huelswitt@gmx.de>
  Suggestions about better ways of handling the PCM16-data and the support
  during the design of their implementation. (for span-0.0.4)