This is a bugfix release with no breaking changes. 3.9 users are advised to upgrade if possible.

Contributors to this release: brianlheim, mneilsen, patrickdupuis, telephon

• It is now possible to build the project using a system install of yaml-cpp. Previously the SYSTEM_YAMLCPP CMake option was broken (#3557).
• Improvements to documentation on writing and designing classes (#3605).
• Fixed a regression from 3.8 to 3.9 that prevented the tilde character from being expanded to the user’s home directory during class library compilation (#3646).
• Fixed an issue with handling of ranges in RangeSlider:setSpan and :setDeviation (#3620).
• Fixed a regression in Score’s multichannel expansion from 3.9.1 to 3.9.2 (#3608).

You can download SuperCollider 3.9.3 from the release page.