The TheoryBoard (thread) is great for live chord generation. Similar effects, though not as polished, can be done with various Midi Effects processors and standard MIDI controller keyboards. Take for instance the Blokas MidiHub (thread) – you can generate a generalized chord shape (spread, clustered, bass with harmony, etc) and then map that to a particular scale (lots to chose from) and then generate the MIDI from that. Loopop shows some of that here.
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