I’m aIso running icecast using a raspberry pi to stream XM for MOH. See SiriusXM for Music on Hold -How do I get from here to there? In FreePBX my streaming app is mpg123. /usr/bin/mpg123 -q -s --mono -r 8000 -f 8192 -b 1024 http://192.168.2.36:8000/mic . If your using mpg123 you can try playing around with the -g --gain option. Also you may be able to tweak output using alsa mixer (This is what I ended up doing. I increased the Mic gain). Or try Dicko’s recommendation.