Are you really looking for a sysex message ?
The tempo message shown in your post is a standard MIDI File event, not a MIDI system exclusive message.
Did you use MidiMessage::tempoMetaEvent to built your event ?
I stand corrected, it’s really not a sysex event, and I do use MidiMessage::tempoMetaEvent()
Jules added this code like 10 days ago, and now meta events get written not as they should be.
Thanks a lot for your correction of writeTrack, Joerg. I was going crazy as to why some of my tracks were becoming unreadable after save. I would never have put Jules’ code in doubt…