Klevgränd Produktion has released Svep - phaser, flanger, chorus. They say that Svep offers two separate frequency modulators on each channel. By tweaking the parameters it's possible to create all kinds of phasers, flangers and choruses.
Features:
Pricing and Availability:
$1.99 at the app store.
More information:
Part 2 on revisions that made synths into brand new machines
Developments for Korg's instrument have been slow but promising.