On 2016-09-01 17:29, Bertram Scharpf wrote: > my Sox play tool plays the file, then it freezes. The > remaining process does not answer on Ctrl-C nor on signal > TERM. It only can be removed by signal KILL. 1. Run procstat -k PID for frozen sox play 3. Try to play the same file with another tool, e. g. audio/wavplay