Hi all, I've created a simple little change for rtl_fm which outputs values of 0 (instead of nothing) when the output is squelched. Use the -E nullsquelch option to enable. This is useful when live streaming output to icecast or similar which requires a constant stream of data (such as http://rtl-sdr.com/forum/viewtopic.php?f=7&t=141). Cheers, Wilson.