You should take a look to the documents available on the akai website : as mentioned before the Apc protocol and this one :
Don’t hesitate to ask questions. I’m at the moment using it for building my "big patch" and so far so good found it pretty straight forward to program, much much more than the Launchpad, for example.
@jbl : Please, could elaborate a little bit on the cntrl:r ? I’m curious to know why is it so much better than the apc. It seems to have less encoders with leds and the pads seems smaller.
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