I am developing an iOS Application that connects to a midi keyboard, and controls the keyboard.
I was able to send messages to play notes, change the pitch band, and many other functionalities.
But i was unsuccessful to send system exclusive real time messages, for example microtuning and changing the master volume.
I have tested on several keyboards with no luck.
I am sending for changing the Master volume to 0 the following hexadecimal values :
F0 7F 7F 04 01 00 00 F7
Nothing is changing when i send it, volume remains the same.
Please help, i have no idea what i am missing.