Had to use next-transpile-modules for spectacle. Then ran into window error as spectacle is client side only. Moved entire deck into own component and dynamically loaded that from Next page so it never touches SSR. Fast refresh doesn't create new slides unfortunately.
This should be private as it has samples
Need to create another repo.
Recorded the talk with DSLR cam (thank's to @lazygamer) and Elgato Wave mic.
Needed to internally route audio from Chrome to OBS on a separate channel to the mic.
Exported from OBS to mkv file, this format allows multiple audio channels (eg. for multi language support). However Final Cut Pro didn't support this! So had to convert to mp4, twice for each channel (mic and Chrome audio).
Arranged it all in Final Cut Pro, nothing fancy. Exported to mov, couldn't export to mp4, so had to use Handbrake to convert to mov to mp4.