If sox -r does resampling, then it should be fine - I use something similar to stream the ulaw files to my DSTAR machine (the streaming software wants a wav file). You may find it helpful to adjust the volume using -v For example, this turns it down a bit sox -v -0.6 newsline.mp3 -r 8000 temp.wav Some of the bulletins give you a place to insert a voice ID - and for that you need Audacity, or similar. 73 Ken From: Tim Sawyer [mailto:tim.sawyer@mac.com] Sent: Wednesday, May 28, 2014 12:33 AM To: Bob Cc: Ken; app_rpt-users@ohnosec.org Subject: Re: [App_rpt-users] Playing mp3 files in app_rpt It's real simple to convert .mp3 to a .wav file: sox newsline.mp3 -r 8000 temp.wav The trick is installing SOX with LAME. I found the attached procedure worked for me.