Version 2.4.0

• Support for PulseAudio output via new output type pulse. With this
  feature you can eg. play the sound via the soundcard of the Raspberry
  Pi you run RTLSDR-Airband on (you need to install and run pulseaudio
  daemon on it, though). Or you can stream the audio from a Pi located
  near the antenna (eg. in the attic) to speakers connected to the desktop
  PC you are sitting at, without launching a local Icecast server,
  as before. Because the audio stream is sent uncompressed, it is
  not recommended to run it across the Internet - jitter or packet loss
  will easily cause the audio to become choppy. However in a local network
  PulseAudio is a good choice. And it gives much lower latency as compared
  to Icecast (typically under 0.5 seconds). Thanks to Marcus Ströbel
  for the idea and initial implementation.
• Support for referring to RTL devices by their serial numbers in the
  config file. Instead of "index = <dongle_index>" parameter, use "serial =
  <dongle_serial_number>" to get consistent behavior across reboots
  and hardware reconfigurations.
• Set RTL gain to the nearest gain value supported by the device. This is
  required for E4000 tuners, which do not round the given gain value to
  the nearest supported setting, which causes the gain setting operation
  to fail.
• Improved squelch operation in scan mode. All squelch-related variables
  (noise floor, AGC coefficients, etc) are now calculated and stored
  separately for each scanned channel. Earlier their values were common
  to all channels, which caused squelch problems in case when noise floor
  varied considerably between channels. Thanks to @strix-technica.
• Added build target for FreeBSD on x86. Use PLATFORM=x86-freebsd to
  compile and PLATFORM=x86-freebsd gmake install to install. Thanks
  to @nyammy.
• Display squelch setting in waterfall in place of noise floor value when
  squelch is set manually.
• Bug fixes, performance improvements.
• Decluttered and more understandable documentation.