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New MIDI Controller with 60 Knobs!!
A MIDI controller with 60 knobs for 129 euros
https://ask.audio/articles/bastl-60knobs-is-a-129-diy-midi-controller-for-just-about-everything
All the knobs are customizable through software, and 5 user sets can be kept.
Could be an ultimate controller for one of the more complex iPad synths....
But it is a DIY project. Soldering required... 
Comments
You had me right up until soldering....
eventually someone seems to have implemented an old design idea I had ages ago:
the rotaries send pulses (key-clicks by turning) to an abused PC-keyboard controller chip.
All the matrix decoding is already present, no custom software required.
I knew it would end dead cheap, so never minded to work that out.
Midi software looks cool, though
Sixty knobs? What a lot of balls!