I take a hands-on look at Spanner 5, The Cargo Cult's immersive channel panning plugin, now available in VST3 and Audio Unit alongside its long-standing Pro Tools version. I show how it handles panning, up-mixing, and down-mixing across Reaper, solve a Reaper specific channel routing issue, and share my honest verdict.

In this tutorial, I walk you through the complete workflow of setting up Eclipsa Audio plugins in Reaper to create immersive audio in the IAMF format, covering everything from configuring the renderer and creating audio elements to routing tracks using both built-in and third-party Ambisonics panners. I'll demonstrate the practical process using a four-track session, showing how to work with YouTube's Base profile to create a 16-channel third-order Ambisonics environment with an additional stereo element, and finally export your project as an IAMF file ready for upload.