Read through the FMOD manual and the UE4 integration guide and you’ll be flying in minutes. I used it for the first time the other day and think it’s great. I’m not aware of any midi libraries/plug-ins for UE4 although suspect they exist. I opted FMOD due to the precision of the timers, the on tick event and ms precision timers just don’t cut it. Although this is only important if you were triggering audio rather than moving object etc…