Forgot to mention: Octatrack needs at least one good separate midi controller.
To get an OT under control (mostly but not only) in a live situation needs a flexible controller.
I think of a slider for volume per track and a few knobs for each channel.
I have an old UC33 which covers the standard use cases, faderfox EC4 and recently started to incorporate a tablet with touchOSC.
It just also makes so much more fun if you don´t have to menu-dive all the time for even the simplest adaptions.