PLN: 'maybe with reverb over last 5s so we hear it slightly echo as last sound'.
Rendered as an A/B rather than baked in — an echo on the final sound of a record
is a taste call, and 'maybe' is not a decision.

Two flavours (subtle / more) plus the dry render, so the comparison is three
clips in the same view. The wet part is the TAIL ONLY: a global reverb would
wash the whole ending, and everything before the last 5s stays identical to dry.
The tail gets apad before the echo so the ring has somewhere to go — without it
ffmpeg chops at the last sample and the 'echo as last sound' becomes another
hard cut, which is the thing being fixed.