The simplest way to add my arpeggiator to any patch, that plays MIDI notes, is this:
Add these three objects anywhere to the patch and set the MIDI channel of the arpeggiator to the channel for incoming notes, which should be arpeggiated (e.g. from your keyboard) and the channel of the "midi/intern/note" object to the channel the patch is set to receives notes.
If you want to sync the arpeggio to incoming MIDI clock signals, you can trigger the arpeggiator clock with the output of a factory "midi/in/clock" object and maybe some appropriate clock division counter to get half, quarter, eighth or sixteenth notes...
The usage of the arpeggiator object should be quite self-explanatory, but here's the doc.
Hope that helps!