10.06.19 : 0.6 : first distributed version
17.06.19 : 0.7 : corrected terminology in filter options: now LOWF is really the 
           lower edge filter frequency and HIGHF is really the upper edge. Hence,
           setting only HIGHF applies a low pass filter!
24.06.19 : 1.0 : added option NOISEPROFILE
30.06.19 : 1.1 : bug fix : conversion of MP3 files failed -> fixed
07.07.19 : 1.2 : eliminated sox warnings with NOISE > 0
