The OP has since moved on to greener pastures, but I am thinking the original question doesn’t make sense. Why change/increment the same sysex message by two values immediately in rapid succession? The value will always end up being the last value (the incremented by two value) and if this sysex message is the actual message, what is the machine ID and device ID? You list both as 00. Also, usually Roland machines have a checksum byte which is also missing in the sysex as supplied. Maybe it’s just an example sysex, but I would be interested to know what machine you are working on and why the same message gets incremented twice. Maybe each sysex message is actually different?
