Automating the ProChannel Arpeggiator

My understanding is that arpeggiator settings are in the Track view, Track Inspector, often found to the left of the tracks. When I look, I see a heading section that shows properties of the clip or track depending on which tab is clicked. Under that there are two columns of settings. The column closest to the tracks begins with knobs for chorus and reverb, then settings for snap to scale, then settings for input quantize, then settings for the arpeggiator. Click on the on/off button next to the "Latch" button to turn it on. Many settings available to work with.
 
Edited to add for clarity: Of course, the arpeggiator is found in the track view of a MIDI track because you are working with MIDI. The ProChannel hosts Audio processing and Audio effects, so no MIDI arpeggiator there.
 
Edited to further add: If you are working with a "simple instrument" track, things get more confusing. A "simple" instrument track has the complexity of combining the MIDI track of notes for the synthesizer to play and the Audio track for the sound from the synthesizer. For the "simple" track, the track inspector defaults to showing the Audio options. A right click on the track number gives a context menu with an option to "split instrument track." Do that, and the now-visible MIDI track has the arpeggiator in the inspector area.