I think mlr like functionality would work for many user cases. Essentially it’s like the main function of earthsea. Recording sequences of button pushes, then manipulating that sequence. With ansible you should be able to get 4cv/gate recorders that allow you to play and chop your button sequences. That would work great for any oscillator,sampler, filter,etc.
A specific firmware for the er-301 one would be mad. But even a general mlr like recorder would be amazing.

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