Airtime 2.4.0 adds Opus streaming and Web Audio API crossfade previews
The latest Airtime release includes support for Ogg Opus low-latency streaming. You'll need to be running Icecast 2.4 beta for this to work, which you can get in packaged form for your GNU/Linux distro of choice from: https://build.opensuse.org/package/show?package=icecast&project=home%3Ad...
Another neat feature in this version of Airtime is a visual crossfade editor which uses the Web Audio API to display the waveforms. This requires Chrome or a forthcoming Firefox release to work, but it's very promising.
The Airtime manual has been fully revised and updated for version 2.4.0.