Razor editing
Use opt+right-click to razor edit.1 Use opt+shift+s to split (see Split items).
In Preferences > Media Item Defaults, you can enable “Overlap and crossfade media when finalizing razor edits.”2
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[What’s New in REAPER 6.43 r8brain; razor edit crossfades; CAF support and more - YouTube](https://www.youtube.com/watch?v=DjLvraCQiVs&t=792s)