A big green button that changes all the settings randomly on every single device within Live. This would prove quite a function to see how well you know your setup, and how fast you can get it back (except ctrl+z/apple+z)
Secondly a BPM counting VST/plugin, so you can take a live kick drum for instance and be locked in, independent of clock.
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Master Randomise
Master Randomise
Circuit bending is fun!