The program was called Slow Blast. It was bundled with BIAB, so it was a separate program. The upgrade was Slow Gold, which is still on the market for $39.95.

And of course dedicated audio editing programs can adjust speed.

The OP requested this feature within BIAB, something it has not done.


BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.