I'm a big fan of Arpeggiators. Unfortunately, on these old pre-MIDI Korgs, you can't easily keep the arpeggiator in-sync with MIDI devices such as drum machines. So, to address this problem, I built a MIDI-to-Trigger converter using an Arduino.
If you're interested, you can check out the link below where I show how I put it together. There's also a demo video of me using it with the arpeggiator in my Mono/Poly. My next post will have a demo with both the Polysix and the Mono/Poly at the same time. Two arps!
http://synthhacker.blogspot.com/2014/02/arpeggiator-fun-my-midi-to-trigger.html
Chip