Douglas

Hi, thanks for the answer. I downloaded a midi monitor. This is what is sent to the PC when I press the middle C note. 

Every note always comes with the Controller 88 + a different number, before the on and off signals. 

Here are the pedal signals: 

And here some buttons: 

After more research, here's what I've found. In the Casio Px-750 midi specification available here (https://support.casio.com/storage/en/manual/pdf/EN/008/PX150-1200_AP250-650_MIDI_E_B_EN.pdf):  Apparently the Control 88 message is sent every time 'the tone is changed'.

I found two forum posts where the issue happened to other users. Here's the explanations (https://www.casiomusicforums.com/index.php?/topic/6784-solved-what-is-controller-88-being-used-for/):  And here (https://www.casiomusicforums.com/index.php?/topic/8081-px350-odd-midi-input-behavior/)  And here (https://www.casiomusicforums.com/index.php?/topic/7918-px-5s-transmitting-midi-controller-88-to-daw/): 

Apparently the midi specification has changed over the years, and old devices have this issue. I searched the piano manuals, googled, and asked ChatGPT if there's a way to turn...

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