Japanese synth manufacturer Korg have announced
a Nintendo DS emulation of their
MS-10 semi-modular synth. (They're those small L-shaped ones with the patch cords you sometimes see at gigs.) The Korg DS-10 is being developed by AQ Interactive, and will be released in July 2008, though only in Japan. From the screenshots, it appears to be labelled in English, so ¥4,800 could get you a usable copy.