A reverb tail where your song stops, a reverse swell where it starts. One click in DaVinci Resolve.

• Tail: put the playhead where the song should end and click Tail. The song stops there and its own reverb rings out.
• Intro: a reverse swell that lands on the song's first hit.
• See it first: the panel shows the song and its reverb, and follows Length and Reverb as you change them.

One file, nothing to install. DaVinci Resolve Studio on a Mac. Includes a one-page PDF guide.