yeah, I use a crack. for sure that arp in that song can be found with chipsounds, it's a standard patch. I wanted to figure it out too, I kept hearing that arp in songs and couldn't quite emulate with any of the synths I found, until I got Chipsounds. Here's a cool list of 8bit plugs I found, I ...

I looked hi and lo for the best synth to recreate this sound. By far the best synth I found is the Chipsounds by Plogue arts http://www.plogue.com/?page_id=43 In my opinion it has the best sounds for 8bit, it emulates a wide variety of chips, come with tons of awesome presets, and it's arpeggiator ...