Midi information not showing individual notes – Logic Pro

I haven’t used the specific hardware you mention, but I’ll go ahead and point out what’s probably obvious, which is that if the external instrument is doing the arpeggiating, generally the un-arpeggiated MIDI is exactly what you’d want to record, because then when you play it back via the external instrument, you’ll get the arpeggiation again.

Maybe someone else knows the hardware you mention and will understand better, but meanwhile, can you explain why you want to capture the arpeggiated MIDI specifically? (Maybe that’s a stupid question and I’m just not getting it…)