MPC X, MPC Live, MPC One & MPC Key 61 Forum: Support and discussion for the MPC X, MPC Live, MPC Live II, MPC One & MPC Key 61; Akai's current generation of standalone MPCs.
By giacecco Fri Feb 03, 2023 2:27 pm
With firmware 2.11.7 on MPC X. To reproduce:

1) connect an external MIDI controller using USB
2) set any parameter of an external synth to be controlled using an innocuous CC, e.g. CC 20 to control the LP filter cutoff
3) in the MPC X, open MIDI Learn and configure an element of the MIDI controller - say, one encoder - to use as source the Program corresponding to the synth's MIDI port, and as target the CC you set at point (2)
4) move the encoder even just a little

AND

Sometimes everything works great, and you're controlling the filter cutoff with the external MIDI controller.

Some other times the MPC X starts sending an infinite series of apparently random CC 20 signals to the synth - you can also see it in MPC X's MIDI monitor - and after a while the MPC X hangs.

What is happening here? Is it a bug or I am doing something wrong? Thanks!
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By Lampdog Sat Feb 04, 2023 3:08 pm
I didn’t even get thru the whole experiment before my X started to lock up, touch and button delays, wouldn’t shutdown, I had to unplug power.

Something with midi learn seems like the cause.