I'm building a USB midi footswitch controller which I'm going to use with Mainstage. I succeeded with all the programming. Well almost. I have a problem with communication from Mainstage to my MIDI controller. I know there is a possibility to recieve updates from mainstage about parameters I'm controlling with my MIDI device. (I use also nanokontroll2 which works like that - it's recieving LED's updates from mainstage).
Maybe some of you know what type of messages I should sniff for. I'm even not shure if these are midi data or more specific SysEx.
Maybe there is a way I could sniff my USB connection from MacOS or directly on Arduino.
I will be thankfull for any help or advice.