Hi.
If I've interpreted you right, it's the way you want it.
You start a midifile and it will then turn down the sound on channel 4, as well as automatically load audio for your own playing on the keyboard.
This is fully possible to do in all PSRs, Tyros and even in Yamaha Genos.
You then have to enter some parameters in the keyboard and change some.
You can either delete all information on track 4 or just turn down the volume so that this track is not heard.
To get the keyboard to self-record sound for your own accordion on the keyboard, you can enter how many instrument shifts you want during the midfile time for your own game.
Then the midifile will automatically switch audio whenever you want.
I have included in my midifiles chord display, notepad and text, plus the midifiles automatically load microphone settings, start and stop of carts, etc.
Translated by Google so errors can occur!
Tommy