Version 3.1 brings two new backends, optional loudness and convolution filters, improvements in non-synchronised backends, enhancements, stability improvements and bug fixes.
**New Features**
-* A `sndio` backend gives Shairport Sync a fully synchronised backend that works natively on OpenBSD and FreeBSD, thanks to the work of [t6](https://github.com/t6).
+* A `sndio` backend gives Shairport Sync a fully synchronised backend that works natively on OpenBSD and FreeBSD, thanks to the work of [Tobias Kortkamp (t6)](https://github.com/t6).
* A `pa` backend now allows Shairport Sync to work well with a PulseAudio-equipped system -- many desktop Linuxes use PulseAudio as their sound manager.
* Optional loudness and convolution filters can be incorporated in the audio processing chain, thanks to [yannpom](https://github.com/yannpom).
* A volume-change program hook has been added to execute an application whenever the volume is changed.
* Improvements have been made to the handling of large items of metadata over UDP.
* A new command line option, `-j`, demonizes Shairport Sync without creating a PID file.
* A new `alsa`-only setting, `mute_using_playback_switch`, is available for advanced use.
+* Other minor enhancements.
**Bug Fixes**
* Stability improvements. More care has been taken (!) to make code thread-safe, resulting in improved stability.
-* Conversion from stereo to mono has been fixed to avoid clipping while preserving full resolution.
+* Conversion from stereo to mono has been fixed to avoid clipping while preserving full resolution. Thanks to [Robert Jones (RobDeBagel)](https://github.com/RobDeBagel) for bring this to attention.
* Short intrusions of audio at the start of a new session from the end of the previous session have been eliminated.
* Many (many!) miscellaneous bugs fixed.