Hello:
Sorry for the necro bumping and the long post.
I can confirm the bug.
General setupMPC One FW version: 2.11.4
UNO SYNTH ACTING AS MIDI CONTROLLER. No sound.
Connected by usb. Shows as a port in the MPC.
Roland ED PC180A, external keyboard/midi controller.
Connected by IN DIN connector in the back of the MPC.
Two tracks created in the MPC one:Track 1IN UNO_Synth_MIDI_1 channel 9
Configure a plugin here. Ie, Tube Synth
Track 2IN MPC channel 1 (keyboard connected here).
Configure a plugin here. Ie, Odyssey.
Test 1Press one specific note (example C2) in the keyboard of the uno synth. Keep it pressed. Tube synth plugin sounds.
Press same note in Roland PC180A. Odyssey plugin doesn't sound.
WRONG BEHAVIOUR (as another colleague -Bradley Smith- was clarifying in this thread). Seems to be different in older FWs.
Test 2Press C2 note in Roland PC180A. Odyssey plugin sounds.
Press same note in the keyboard of the uno synth. Keep it pressed. Tube synth plugin doesn't sound.
SAME BEHAVIOUR.
In both cases, midi traffic data can be seen in the MPC's midi monitor.
More relevant informationI end up here because I was trying to sequence from the UNO Synth (this small little synth includes a cool monophonic sequencer very interesting because it can be looped for ever as recording and let you modify sequences on the fly... the original idea was to record those sequences in the MPC One. Of course in order to introduce notes, I thought that it would be better with the master keyboard (UNO synth keyboard is ok for a capacitive, but not great).
I found that, with a similar configuration as the one here, my keyboard had something like "disabled" keys. I was monitoring the IO of the midi outputs connecting them to a computer and sniffing the outputs (at the begining I was actually suspecting more about the uno); I found that the uno synth (acting as sequencer) was sending only note on messages at some point (this was right because I programed the secuence so, to make use of the glide effect). During the time that the note on was there, it wasn't possible to insert the same notes neither with the keyboard nor with the pads.
If felt like some of the keyboard keys were "dead".
What is more interesting about that configuration is that even using the pads, the behaviour is the same... note on/off sent by external devices in any channel are affecting everything.
Now, I can see that it seems to be related to this multichannel midi bug.
Sad because even when I found a workaround for my sequence recording (just use the keyboard of the synth to introduce notes in the synth sequencer), makes difficult to think in the MPC as an arrenger to play several instruments at the same time... and that was one of the reasons why I was buying it.
It seems that Akai is aware of this:
https://www.akaipro.com/mpc-release-notes