I did a bit of reading and I think I now know why big set-ups use wordclock to help enhance stability in MIDI playback. This is because big setups like those in a big live act use SMPTE for synchronization, usually because they’re also syncing lights and video playback to the music (or editing video to the music later on). The problem with SMPTE however is that there’s a bit of drift built into it, so the addition of a wordclock signal helps eliminate this. I think I have that right 