Contrary to previous releases, there were not many graphical changes this time, but lots of stuff under the hood. One very important note for developers is that the \"native\" API to access carla as plugin (as used by LMMS) is still ABI and API-wise backwards compatible with 2.0, but the ABI and API of Carla as a library is not. This is because all host functions now have a \"handle\" prefix, so they can be reused for standalone, plugin and other variants.
Carla has an LMMS plugin too, as Carla-Patchbay and Carla-Rack instruments. So finally you can use native softsynths within LMMS! The carla-lmms plugin code is already in LMMS and will be part of its 1.1 release. If you're using the KXStudio repositories and feel like giving it a try simply install carla-git and lmms. 153554b96e