Hey there.
Good to hear that you are getting back on track with the machine. For my part, I first got to know about it in 2024. My first hardware sampler. And I love it!
Anyways, this might not be exactly what you ask for, but a suggestion could be to read through the firmware update thread.
It could give a pretty good and quick overview I guess. All the new features are listed in bullet points for each update.
Maybe rewatching the video manual from the Isla Instruments YT page at first could be a good “beginning” before jumping to the updates. It is from late 2022. Although there has been several updates since, I think it is still of highly relevance.