The key assignment of the drum program changes by itself.

[cortasan]

Does anyone have a cause or a solution?
M50's Strange behavior:.

When a drum kit program is played externally with MIDI data in sequence mode (so-called multi-mode),

From a certain moment, the key assignment of the drum kit goes up by one.

Choose the Stadio Standard Kit, for example

Midi Data : Sound from the M50

BankSelect 0
BankSelect 32
program change
D3 : Snare Drum
E3 : Snare Drum

：

This is where I paused and replay

：

BankSelect 0
BankSelect 32
program change
D3 : SideStick
E3 : Hand Craps
　
That's right, SideStick is originally a C#3 , Hand Craps is originally a D#3
That is, the key assignment goes up by one.

Once it's out of whack, it can't be reversed by adjusting the MIDI data.
I rebooted the M50 several times and it finally came back to normal.

Why???????